Wilderness or wildlands (usually in the plural), are natural environments on Earth that have not been significantly modified by human activity or any nonurbanized land not under extensive agricultural cultivation.   The term has traditionally referred to terrestrial environments, though growing attention is being placed on marine wilderness. Recent maps of wilderness  suggest it covers roughly one quarter of Earth's terrestrial surface, but is being rapidly degraded by human activity.  Even less wilderness remains in the ocean, with only 13.2% free from intense human activity. 
Some governments establish protection for wilderness areas by law to not only preserve what already exists, but also to promote and advance a natural expression and development. These can be set up in preserves, conservation preserves, national forests, national parks and even in urban areas along rivers, gulches or otherwise undeveloped areas. Often these areas are considered important for the survival of certain species, biodiversity, ecological studies, conservation, solitude and recreation.  They may also preserve historic genetic traits and provide habitat for wild flora and fauna that may be difficult to recreate in zoos, arboretums or laboratories.
Looked at through the lens of the visual arts, nature and wildness have been important subjects in various epochs of world history. An early tradition of landscape art occurred in the Tang Dynasty (618-907). The tradition of representing nature as it is became one of the aims of Chinese painting and was a significant influence in Asian art. Artists in the tradition of Shan shui (lit. mountain-water-picture), learned to depict mountains and rivers "from the perspective of nature as a whole and on the basis of their understanding of the laws of nature… as if seen through the eyes of a bird." In the 13th century, Shih Erh Chi recommended avoiding painting "scenes lacking any places made inaccessible by nature." 
For most of human history, the greater part of the Earth's terrain was wilderness, and human attention was concentrated on settled areas. The first known laws to protect parts of nature date back to the Babylonian Empire and Chinese Empire. Ashoka, the Great Mauryan King, defined the first laws in the world to protect flora and fauna in Edicts of Ashoka around 3rd Century B.C. In the Middle Ages, the Kings of England initiated one of the world's first conscious efforts to protect natural areas. They were motivated by a desire to be able to hunt wild animals in private hunting preserves rather than a desire to protect wilderness. Nevertheless, in order to have animals to hunt they would have to protect wildlife from subsistence hunting and the land from villagers gathering firewood.  Similar measures were introduced in other European countries.
However, in European cultures, throughout the Middle Ages, wilderness generally was not regarded worth protecting but rather judged strongly negative as a dangerous place and as a moral counter-world to the realm of culture and godly life.  "While archaic nature religions oriented themselves towards nature, in medieval Christendom this orientation was replaced by one towards divine law. The divine was no longer to be found in nature; instead, uncultivated nature became a site of the sinister and the demonic. It was considered as corrupted by the Fall (natura lapsa), becoming a vale of tears in which humans were doomed to live out their existence. Thus, for example, mountains were interpreted [e.g, by Thomas Burnet ] as ruins of a once flat earth destroyed by the Flood, with the seas as the remains of that Flood."  "If paradise was early man's greatest good, wilderness, as its antipode, was his greatest evil." 
The idea of wilderness having intrinsic value emerged in the Western world in the 19th century. British artists John Constable and J. M. W. Turner turned their attention to capturing the beauty of the natural world in their paintings. Prior to that, paintings had been primarily of religious scenes or of human beings. William Wordsworth's poetry described the wonder of the natural world, which had formerly been viewed as a threatening place. Increasingly the valuing of nature became an aspect of Western culture. 
By the mid-19th century, in Germany, "Scientific Conservation," as it was called, advocated "the efficient utilization of natural resources through the application of science and technology." Concepts of forest management based on the German approach were applied in other parts of the world, but with varying degrees of success.  Over the course of the 19th century wilderness became viewed not as a place to fear but a place to enjoy and protect, hence came the conservation movement in the latter half of the 19th century. Rivers were rafted and mountains were climbed solely for the sake of recreation, not to determine their geographical context.
In 1861, following an intense lobbying by artists (painters), the French Waters and Forests Military Agency set an « artistic reserve » in Fontainebleau State Forest. With a total of 1 097 hectares, it is known to be the first World nature reserve.
Global conservation became an issue at the time of the dissolution of the British Empire in Africa in the late 1940s. The British established great wildlife preserves there. As before, this interest in conservation had an economic motive: in this case, big game hunting. Nevertheless, this led to growing recognition in the 1950s and the early 1960s of the need to protect large spaces for wildlife conservation worldwide. The World Wildlife Fund (WWF), founded in 1961, grew to be one of the largest conservation organizations in the world. 
Early conservationists advocated the creation of a legal mechanism by which boundaries could be set on human activities in order to preserve natural and unique lands for the enjoyment and use of future generations. This profound shift in wilderness thought reached a pinnacle in the US with the passage of the Wilderness Act of 1964, which allowed for parts of U.S. National Forests to be designated as "wilderness preserves". Similar acts, such as the 1975 Eastern Wilderness Areas Act, followed.
Nevertheless, initiatives for wilderness conservation continue to increase. There are a growing number of projects to protect tropical rainforests through conservation initiatives. There are also large-scale projects to conserve wilderness regions, such as Canada's Boreal Forest Conservation Framework. The Framework calls for conservation of 50 percent of the 6,000,000 square kilometres of boreal forest in Canada's north.  In addition to the World Wildlife Fund, organizations such as the Wildlife Conservation Society, the WILD Foundation, The Nature Conservancy, Conservation International, The Wilderness Society (United States) and many others are active in such conservation efforts.
The 21st century has seen another slight shift in wilderness thought and theory. It is now understood that simply drawing lines around a piece of land and declaring it a wilderness does not necessarily make it a wilderness. All landscapes are intricately connected and what happens outside a wilderness certainly affects what happens inside it. For example, air pollution from Los Angeles and the California Central Valley affects Kern Canyon and Sequoia National Park. The national park has miles of "wilderness" but the air is filled with pollution from the valley. This gives rise to the paradox of what a wilderness really is; a key issue in 21st century wilderness thought.
The creation of National Parks, beginning in the 19th century, preserved some especially attractive and notable areas, but the pursuits of commerce, lifestyle, and recreation combined with increases in human population have continued to result in human modification of relatively untouched areas. Such human activity often negatively impacts native flora and fauna. As such, to better protect critical habitats and preserve low-impact recreational opportunities, legal concepts of "wilderness" were established in many countries, beginning with the United States (see below).
The first National Park was Yellowstone, which was signed into law by U.S. President Ulysses S. Grant on 1 March 1872.  The Act of Dedication declared Yellowstone a land "hereby reserved and withdrawn from settlement, occupancy, or sale under the laws of the United States, and dedicated and set apart as a public park or pleasuring ground for the benefit and enjoyment of the people." 
The U.S. concept of national parks soon caught on in Canada, which created Banff National Park in 1885, at the same time as the transcontinental Canadian Pacific Railway was being built. The creation of this and other parks showed a growing appreciation of wild nature, but also an economic reality. The railways wanted to entice people to travel west. Parks such as Banff and Yellowstone gained favor as the railroads advertised travel to "the great wild spaces" of North America. When outdoorsman Teddy Roosevelt became president of the United States, he began to enlarge the U.S. National Parks system, and established the National Forest system. 
By the 1920s, travel across North America by train to experience the "wilderness" (often viewing it only through windows) had become very popular. This led to the commercialization of some of Canada's National Parks with the building of great hotels such as the Banff Springs Hotel and Chateau Lake Louise.
Despite their similar name, national parks in England and Wales are quite different from national parks in many other countries. Unlike most other countries, in England and Wales, designation as a national park may include substantial settlements and human land uses which are often integral parts of the landscape, and land within a national park remains largely in private ownership. Each park is operated by its own national park authority.
By the later 19th century it had become clear that in many countries wild areas had either disappeared or were in danger of disappearing. This realization gave rise to the conservation movement in the United States, partly through the efforts of writers and activists such as John Burroughs, Aldo Leopold, and John Muir, and politicians such as U.S. President Teddy Roosevelt.
The idea of protecting nature for nature's sake began to gain more recognition in the 1930s with American writers like Aldo Leopold, calling for a "land ethic" and urging wilderness protection. It had become increasingly clear that wild spaces were disappearing rapidly and that decisive action was needed to save them. Wilderness preservation is central to deep ecology; a philosophy that believes in an inherent worth of all living beings, regardless of their instrumental utility to human needs. 
Two different groups had emerged within the US environmental movement by the early 20th century: the conservationists and the preservationists. The initial consensus among conservationists was split into "utilitarian conservationists" later to be referred to as conservationists, and "aesthetic conservationists" or preservationists. The main representative for the former was Gifford Pinchot, first Chief of the United States Forest Service, and they focused on the proper use of nature, whereas the preservationists sought the protection of nature from use.  Put another way, conservation sought to regulate human use while preservation sought to eliminate human impact altogether. The management of US public lands during the years 1960s and 70s reflected these dual visions, with conservationists dominating the Forest Service, and preservationists the Park Service 
There have been recent calls for the World Heritage Convention to better protect wilderness  and to include the word wilderness in their selection criteria for Natural Heritage Sites
Forty-eight countries have wilderness areas established via legislative designation as IUCN protected area management Category 1b sites that do not overlap with any other IUCN designation. They are: Australia, Austria, Bahamas, Bangladesh, Bermuda, Bosnia and Herzegovina, Botswana, Canada, Cayman Islands, Costa Rica, Croatia, Cuba, Czech Republic, Democratic Republic of Congo, Denmark, Dominican Republic, Equatorial Guinea, Estonia, Finland, French Guyana, Greenland, Iceland, India, Indonesia, Japan, Latvia, Liechtenstein, Luxembourg, Malta, Marshall Islands, Mexico, Mongolia, Nepal, New Zealand, Norway, Northern Mariana Islands, Portugal, Seychelles, Serbia, Singapore, Slovakia, Slovenia, Spain, Sri Lanka, Sweden, Tanzania, United States of America, and Zimbabwe. At publication, there are 2,992 marine and terrestrial wilderness areas registered with the IUCN as solely Category 1b sites. 
Twenty-two other countries have wilderness areas. These wilderness areas are established via administrative designation or wilderness zones within protected areas. Whereas the above listing contains countries with wilderness exclusively designated as Category 1b sites, some of the below-listed countries contain protected areas with multiple management categories including Category 1b. They are: Argentina, Bhutan, Brazil, Chile, Honduras, Germany, Italy, Kenya, Malaysia, Namibia, Nepal, Pakistan, Panama, Peru, Philippines, the Russian Federation, South Africa, Switzerland, Uganda, Ukraine, the United Kingdom of Great Britain and Northern Ireland, Venezuela, and Zambia. 
The German National Strategy on Biological Diversity aims to establish wilderness areas on 2% of its terrestrial territory by 2020 (7,140 km2). However, protected wilderness areas in Germany currently only cover 0.6% of the total terrestrial area. In absence of pristine landscapes, Germany counts national parks (IUCN Category II) as wilderness areas.  Professionally incorrect, the government counts the whole area of the 16 national parks as wilderness. This means, also the managed parts are included in the "existing" 0,6%. There is no doubt, that Germany will miss its own time-dependent quantitative goals, but there are also some critics, that point a bad designation practice: Findings of disturbance ecology, according to which process-based nature conservation and the 2% target could be further qualified by more targeted area designation, pre-treatment and introduction of megaherbivores, are widely neglected.  Since 2019 the government supports bargains of land that will then be designated as wilderness by 10 Mio. Euro annually.  The German minimum size for wilderness candidate sites is normally 10 km2. In some cases (i.e. swamps) the minimum size is 5 km2. 
Since 1861, the French Waters and Forests Military Agency (Administration des Eaux et Forêts) put a strong protection on what was called the « artistic reserve » in Fontainebleau State Forest. With a total of 1,097 hectares, it is known to be the first World nature reserve.
Then in the 1950s,  Integral Biological Reserves (Réserves Biologiques Intégrales, RBI) are dedicated to man free ecosystem evolution, on the contrary of Managed Biological reserves (Réserves Biologiques Dirigées, RBD) where a specific management is applied to conserve vulnerable species or threatened habitats.
Integral Biological Reserves occurs in French State Forests or City Forests and are therefore managed by the National Forests Office. In such reserves, all harvests coupe are forbidden excepted exotic species elimination or track safety works to avoid fallen tree risk to visitors (already existing tracks in or on the edge of the reserve).
At the end of 2014,  there were 60 Integral Biological Reserves in French State Forests for a total area of 111,082 hectares and 10 in City Forests for a total of 2,835 hectares.
In Greece there are some parks called "ethniki drimoi" (εθνικοί δρυμοί, national forests) that are under protection of the Greek government. Such parks include: Olympus, Parnassos and Parnitha National Parks.
Due to Russia's size and in comparison non-dense population settlement, as well as of lack of infrastructure and the decades-long iron curtain the country is considered as one of the least explored areas and most natural places in the world. 
There are seven wilderness areas in New Zealand as defined by the National Parks Act 1980 and the Conservation Act 1987 that fall well within the IUCN definition. Wilderness areas cannot have any human intervention and can only have indigenous species re-introduced into the area if it is compatible with conservation management strategies.
In New Zealand wilderness areas are remote blocks of land that have high natural character.  The Conservation Act 1987 prevents any access by vehicles and livestock, the construction of tracks and buildings, and all indigenous natural resources are protected.  They are generally over 400 km2 in size. 
In the United States, a Wilderness Area is an area of federal land set aside by an act of Congress. It is typically at least 5,000 acres (about 8 mi2 or 20 km2) in size.  Human activities in wilderness areas are restricted to scientific study and non-mechanized recreation; horses are permitted but mechanized vehicles and equipment, such as cars and bicycles, are not.
The United States was one the first countries to officially designate land as "wilderness" through the Wilderness Act of 1964. The Wilderness Act was—and is still—an important part of wilderness designation because it created the legal definition of wilderness and founded the National Wilderness Preservation System. The Wilderness Act defines wilderness as "an area where the earth and its community of life are untrammelled by man, where man himself is a visitor who does not remain." 
Wilderness designation helps preserve the natural state of the land and protects flora and fauna by prohibiting development and providing for non-mechanized recreation only.
The first administratively protected wilderness area in the United States was the Gila National Forest. In 1922, Aldo Leopold, then a ranking member of the U.S. Forest Service, proposed a new management strategy for the Gila National Forest. His proposal was adopted in 1924, and 750 thousand acres of the Gila National Forest became the Gila Wilderness. 
' The Great Swamp in New Jersey was the first formally designated wilderness refuge in the United States. It was declared a wildlife refuge on 3 November 1960. In 1966 it was declared a National Natural Landmark and, in 1968, it was given wilderness status. Properties in the swamp had been acquired by a small group of residents of the area, who donated the assembled properties to the federal government as a park for perpetual protection. Today the refuge amounts to 7,600 acres (31 km2) that are within thirty miles of Manhattan. 
While wilderness designations were originally granted by an Act of Congress for Federal land that retained a "primeval character", meaning that it had not suffered from human habitation or development, the Eastern Wilderness Act of 1975 extended the protection of the NWPS to areas in the eastern States that were not initially considered for inclusion in the Wilderness Act. This act allowed lands that did not meet the constraints of size, roadlessness, or human impact to be designated as wilderness areas under the belief that they could be returned to a "primeval" state through preservation. 
Approximately 107,500,000 acres (435,000 km2) are designated as wilderness in the United States. This accounts for 4.82% of the country's total land area; however, 54% of that amount is found in Alaska (recreation and development in Alaskan wilderness is often less restrictive), while only 2.58% of the lower continental United States is designated as wilderness. Following the Omnibus Public Land Management Act of 2009 there are 756 separate wilderness designations in the United States ranging in size from Florida's Pelican Island at 5 acres (20,000 m2) to Alaska's Wrangell-Saint Elias at 9,078,675 acres (36,740.09 km2).
In Western Australia,  a Wilderness Area is an area that has a wilderness quality rating of 12 or greater and meets a minimum size threshold of 80 km2 in temperate areas or 200 km2 in arid and tropical areas. A wilderness area is gazetted under section 62(1)(a) of the Conservation and Land Management Act 1984 by the Minister on any land that is vested in the Conservation Commission of Western Australia.
At the forefront of the international wilderness movement has been The WILD Foundation, its founder Ian Player and its network of sister and partner organizations around the globe. The pioneer World Wilderness Congress in 1977 introduced the wilderness concept as an issue of international importance, and began the process of defining the term in biological and social contexts. Today, this work is continued by many international groups who still look to the World Wilderness Congress as the international venue for wilderness and to The WILD Foundation network for wilderness tools and action. The WILD Foundation also publishes the standard references for wilderness professionals and others involved in the issues: Wilderness Management: Stewardship and Protection of Resources and Values, the International Journal of Wilderness, A Handbook on International Wilderness Law and Policy and Protecting Wild Nature on Native Lands are the backbone of information and management tools for international wilderness issues.
The Wilderness Specialist Group within the World Commission on Protected Areas (WTF/WCPA) of the International Union for the Conservation of Nature (IUCN) plays a critical role in defining legal and management guidelines for wilderness at the international level and is also a clearing-house for information on wilderness issues.  The IUCN Protected Areas Classification System defines wilderness as "A large area of unmodified or slightly modified land, and/or sea retaining its natural character and influence, without permanent or significant habitation, which is protected and managed so as to preserve its natural condition ( Category 1b)." The WILD Foundation founded the WTF/WCPA in 2002 and remains co-chair.
The most recent efforts to map wilderness show that less than one quarter (~23%) of the world's wilderness area now remains, and that there have been catastrophic declines in wilderness extent over the last two decades. Over 3 million square kilometers (10 percent) of wilderness was converted to human land-uses. The Amazon and Congo rain forests suffered the most loss. Human pressure is starting to extend into almost every corner of the planet. The loss of wilderness could have serious implications for biodiversity conservation.
A previous study, Wilderness: Earth's Last Wild Places, carried out by Conservation International, 46% of the world's land mass is wilderness. For purposes of this report, "wilderness" was defined as an area that "has 70% or more of its original vegetation intact, covers at least 10,000 square kilometers (3,900 sq mi) and must have fewer than five people per square kilometer."  However, an IUCN/ UNEP report published in 2003, found that only 10.9% of the world's land mass is currently a Category 1 Protected Area, that is, either a strict nature reserve (5.5%) or protected wilderness (5.4%).  Such areas remain relatively untouched by humans. Of course, there are large tracts of lands in National Parks and other protected areas that would also qualify as wilderness. However, many protected areas have some degree of human modification or activity, so a definitive estimate of true wilderness is difficult.
The Wildlife Conservation Society generated a human footprint using a number of indicators, the absence of which indicate wildness: human population density, human access via roads and rivers, human infrastructure for agriculture and settlements and the presence of industrial power (lights visible from space). The society estimates that 26% of the Earth's land mass falls into the category of "Last of the wild." The wildest regions of the world include the Arctic Tundra, the Siberia Taiga, the Amazonia Rainforest, the Tibetan Plateau, the Australia Outback and deserts such as the Sahara, and the Gobi.  However, from the 1970s, numerous geoglyphs have been discovered on deforested land in the Amazon rainforest, leading to claims about Pre-Columbian civilizations.   The BBC's Unnatural Histories claimed that the Amazon rainforest, rather than being a pristine wilderness, has been shaped by man for at least 11,000 years through practices such as forest gardening and terra preta. 
The percentage of land area designated "wilderness" does not necessarily reflect a measure of its biodiversity. Of the last natural wilderness areas, the taiga—which is mostly wilderness—represents 11% of the total land mass in the Northern Hemisphere.  Tropical rainforest represent a further 7% of the world's land base.  Estimates of the Earth's remaining wilderness underscore the rate at which these lands are being developed, with dramatic declines in biodiversity as a consequence.
The American concept of wilderness has been criticized by some nature writers. For example, William Cronon writes that what he calls a wilderness ethic or cult may "teach us to be dismissive or even contemptuous of such humble places and experiences", and that "wilderness tends to privilege some parts of nature at the expense of others", using as an example "the mighty canyon more inspiring than the humble marsh."  This is most clearly visible with the fact that nearly all U.S. National Parks preserve spectacular canyons and mountains, and it was not until the 1940s that a swamp became a national park— the Everglades. In the mid-20th century national parks started to protect biodiversity, not simply attractive scenery.
Cronon also believes the passion to save wilderness "poses a serious threat to responsible environmentalism" and writes that it allows people to "give ourselves permission to evade responsibility for the lives we actually lead....to the extent that we live in an urban-industrial civilization but at the same time pretend to ourselves that our real home is in the wilderness". 
Michael Pollan has argued that the wilderness ethic leads people to dismiss areas whose wildness is less than absolute. In his book Second Nature, Pollan writes that "once a landscape is no longer 'virgin' it is typically written off as fallen, lost to nature, irredeemable."  Another challenge to the conventional notion of wilderness comes from Robert Winkler in his book, Going Wild: Adventures with Birds in the Suburban Wilderness. "On walks in the unpeopled parts of the suburbs," Winkler writes, "I’ve witnessed the same wild creatures, struggles for survival, and natural beauty that we associate with true wilderness."  Attempts have been made, as in the Pennsylvania Scenic Rivers Act, to distinguish "wild" from various levels of human influence: in the Act, "wild rivers" are "not impounded", "usually not accessible except by trail", and their watersheds and shorelines are "essentially primitive". 
Another source of criticism is that the criteria for wilderness designation is vague and open to interpretation. For example, the Wilderness Act states that wilderness must be roadless. The definition given for roadless is "the absences of roads which have been improved and maintained by mechanical means to insure relatively regular and continuous use."  However, there have been added sub-definitions that have, in essence, made this standard unclear and open to interpretation.
Coming from a different direction, some criticism from the Deep Ecology movement argues against conflating "wilderness" with "wilderness reservations", viewing the latter term as an oxymoron that, by allowing the law as a human construct to define nature, unavoidably voids the very freedom and independence of human control that defines wilderness.  True wilderness requires the ability of life to undergo speciation with as little interference from humanity as possible.  Anthropologist and scholar on wilderness Layla Abdel-Rahim argues that it is necessary to understand the principles that govern the economies of mutual aid and diversification in wilderness from a non-anthropocentric perspective. 
- Aldo Leopold
- Adventure travel
- Biomass (ecology)
- Conservation movement
- Ecological footprint
- Environmental education
- Global warming
- Intact forest landscape
- John Muir Lifetime Achievement Award
- Land use
- Last of the Wild
- Leave no trace
- List of U.S. Wilderness Areas
- List of conservationists
- Bob Marshall
- National Outdoor Leadership School
- National Wilderness Preservation System
- National Wildlife Magazine
- Native American use of fire
- Natural landscape
- Old-growth forest
- Outdoor education
- Planetary habitability
- Protected area
- Wild fisheries
- Wilderness Act (1964)
- Wilderness therapy
- Wilderness Area (Protected Area Management Category)
- World Wilderness Congress
- Terra nullius – International law term meaning territory which has never been the subject of a sovereign nation
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- Rainforest Foundation US. 2006. Commonly asked questions. Retrieved: 2006-07-04.
- The Trouble with Wilderness Archived 27 September 2011 at the Wayback Machine University of Wisconsin-Madison. Retrieved: 28 January 2007.
- Pollan, Michael (2003). Second Nature: A Gardener's Education, p. 188. Grove Press. ISBN 978-0-8021-4011-1.
- Winkler, Robert. (2003). Going Wild: Adventures with Birds in the Suburban Wilderness. National Geographic ISBN 978-0-7922-6168-1.
- Pennsylvania Scenic Rivers Act (P.L. 1277, Act No. 283 as amended by Act 110, May 7, 1982)
- Durrant, Jeffrey O. (2007). Struggle over Utah's San Rafael Swell: Wilderness, National Conservation Areas, and National Monuments. University of Arizona Press. p. 43. ISBN 978-0-8165-2669-7.
- Thomas Birch (1995). George Sessions (ed.). Deep Ecology for the 21st Century. Boston: Shambhala. pp. 345, 339–355. ISBN 978-1-57062-049-2.
- George Sessions (1995). Deep Ecology for the 21st Century. Boston: Shambhala. pp. 323, 323–330. ISBN 978-1-57062-049-2.
- Layla AbdelRahim (2015). Children's Literature, Domestication, and Social Foundation: Narratives of Civilization and Wilderness. New York: Routledge. ISBN 978-0-415-66110-2.
- Bryson, B. (1998). A Walk in the Woods. ISBN 0-7679-0251-3
- Casson, S. et al. (Ed.s). (2016). Wilderness Protected Areas: Management Guidelines for IUCN Category 1b (wilderness) Protected Areas ISBN 978-2-8317-1817-0
- Gutkind, L (Ed). (2002). On Nature: Great Writers on the Great Outdoors. ISBN 1-58542-173-1
- Kirchhoff, Thomas/ Vicenzotti, Vera 2014: A historical and systematic survey of European perceptions of wilderness. Environmental Values 23 (4): 443–464.
- Nash, Roderick Frazier  2014: Wilderness and the American Mind. Fifth Edition. New Haven & London, Yale University Press / Yale Nota Bene.
- Oelschlaeger, Max 1991: The Idea of Wilderness. From Prehistory to the Age of Ecology. New Haven & London, Yale University Press.
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- The Wilderness Society
- Wilderness Information Network
- Wilderness Articles, Survival Techniques, Edible Plants
- Aldo Leopold Wilderness Research Institute
- Wilderness Task Force/World Commission on Protect Areas
- Campaign for America's Wilderness "American Wilderness Philosophy". Internet Encyclopedia of Philosophy.
- Article: The Role of the Wilderness in Storytelling
- Detailed maps of United States wilderness designations
- What is Wilderness? - Definition and discussion of wilderness as a human construction
- Wilderness and the American Mind - by Roderick Nash
- The Trouble with Wilderness; or, Getting Back to the Wrong Nature by William Cronon.