Landsat mosaic, 1999–2001
Location in the state of Hawaii
|Area||4,028 sq mi (10,430 km2)|
|Area rank||75th, largest island in the United States – 1st|
|Highest elevation||13,803 ft (4,207.2 m) |
|Highest point||Mauna Kea|
|Flower||Red Pua Lehua (ʻOhiʻa blossom) |
|Pop. density||46/sq mi (17.8/km2)|
Hawaiʻi (Hawaiian pronunciation: [həˈvɐjʔi]) anglicized Hawaii ( // ( listen) hə-WY-ee) is the largest island located in the U.S. state of Hawaiʻi. It is the largest and the southeasternmost of the Hawaiian Islands, a chain of volcanic islands in the North Pacific Ocean. With an area of 4,028 square miles (10,430 km2), it has 63% of the Hawaiian archipelago's combined landmass, and is the largest island in the United States. However, it has only 13% of Hawaiʻi's people. The island of Hawaiʻi is the third largest island in Polynesia, behind the two main islands of New Zealand. 
Hawaiʻi is said to have been named after Hawaiʻiloa, the legendary Polynesian navigator who first discovered it. Other accounts attribute the name to the legendary realm of Hawaiki, a place from which some Polynesian people are said to have originated, the place where they transition to in the afterlife, or the realm of the gods and goddesses. Captain James Cook, the English explorer and navigator who was captain of the first European expedition that discovered the Hawaiian Islands, called them the "Sandwich Islands" after his patron, the Earl of Sandwich.  Cook was killed on the Big Island at Kealakekua Bay on 14 February 1779, in a mêlée which followed the theft of a ship's boat. 
Hawaiʻi was the home island of Paiʻea Kamehameha, later known as Kamehameha the Great. Kamehameha united most of the Hawaiian islands under his rule in 1795, after several years of war, and gave the kingdom and the island chain the name of his native island.  In 1822 the missionary William Ellis arrived and was one of a party that completed a tour of the island, descriptions of which were later published in his journal. 
According to the U.S. Census Bureau, the county has a total area of 5,086 square miles (13,170 km2), of which 4,028 square miles (10,430 km2) is land and 1,058 square miles (2,740 km2) (20.8%) is water.  The county's land area comprises 62.7 percent of the state's land area. It is the highest percentage by any county in the United States. 
At its greatest dimension, the island is 93 miles (150 km) across. It has a land area of 4,028 square miles (10,430 km2)  comprising 62% of the Hawaiian Islands' land area. Measured from its sea floor base to its highest peak, Mauna Kea is the world's tallest mountain, taller than even Mount Everest, since the base of Mount Everest is above sea level. 
Ka Lae, the southernmost point in the 50 states of the United States, is on Hawaii. The nearest landfall to the south is in the Line Islands. To the northwest of the island of Hawaii is the island of Maui, whose Haleakalā volcano is visible from Hawaiʻi across the Alenuihaha Channel.
- Kohala – extinct
- Mauna Kea – dormant
- Hualālai – dormant
- Mauna Loa – active, partly within Hawaiʻi Volcanoes National Park
- Kīlauea – active: erupting continuously from 1983 to 2018; part of Hawaiʻi Volcanoes National Park
Geological evidence from exposures of old surfaces on the south and west flanks of Mauna Loa led to the proposal that two ancient volcanic shields (named Ninole and Kulani) were all but buried by the younger Mauna Loa.  Geologists now consider these "outcrops" to be part of the earlier building of Mauna Loa.
Because Mauna Loa and Kīlauea are active volcanoes, the island of Hawaii is still growing. Between January 1983 and September 2002, lava flows added 543 acres (220 ha) to the island. Lava flowing from Kīlauea has destroyed several towns, including Kapoho in 1960, and Kalapana and Kaimū in 1990. In 1987 lava filled in "Queen's Bath", a large, L-shaped, freshwater pool in the Kalapana area.[ citation needed] Another 875 acres were added between May to July, 2018 by the 2018 lower Puna eruption.  
Some geologists count seven volcanoes as building the island, which include the submarine volcanoes Māhukona and Lōʻihi as parts of the base of the island.  Māhukona off the northwest corner of the island has already disappeared below the surface of the ocean.  Approximately 22 miles (35 km) southeast of Hawaii lies the undersea volcano known as Lōʻihi. It is an erupting seamount that now reaches approximately 3,200 feet (980 m) below the surface of the ocean. Continued activity at current rates from Lōʻihi will likely cause it to break the surface of the ocean sometime between 10,000 and 100,000 years from now. 
The Great Crack is an eight-mile-long (13,000 m), 60-foot-wide (18 m) and 60-foot-deep (18 m) fissure in the island, in the district of Kau. According to the United States Geological Survey (USGS), the Great Crack is the result of crustal dilation from magmatic intrusions into the southwest rift zone of Kilauea.  While neither the earthquake of 1868 nor that of 1975 caused a measurable change in the Great Crack, lava welled out of the lower 6 miles (10 km) of the Great Crack in 1823. 
Visitors can find trails, rock walls, and archaeological sites from as old as the 12th century around the Great Crack. Approximately 1,951 acres (790 ha) of private land were purchased during the presidency of Bill Clinton, specifically to protect various artifacts in this area, as well as the habitat of local wildlife.[ citation needed]
The Hilina Slump is a 4,760-cubic-mile (19,800 km3) section of the south slope of the Kīlauea volcano which is slipping away from the island. Between 1990 and 1993, Global Positioning System (GPS) measurements showed a southward displacement of about 4 inches (10 cm) per year.  Undersea measurements show that a "bench" has formed a buttress and that this buttress may tend to reduce the likelihood of future catastrophic detachment.  
On 2 April 1868, an earthquake with a magnitude estimated between 7.25 and 7.9 rocked the southeast coast of Hawaiʻi. This was the most destructive earthquake in the recorded history of Hawaiʻi.  It triggered a landslide on Mauna Loa, 5 miles (8 km) north of Pahala, killing 31 people. A tsunami claimed 46 more lives. The villages of Punaluʻu, Nīnole, Kawaʻa, Honuʻapo, and Keauhou Landing were severely damaged. The tsunami reportedly rolled over the tops of the coconut trees up to 60 feet (18 m) high, and it reached inland a distance of a quarter of a mile (400 meters) in some places. 
On 29 November 1975, a 37-mile-wide (60 km) section of the Hilina Slump dropped 11.5 feet (3.5 m) and slid 26 feet (7.9 m) toward the ocean. This movement caused a 7.2 magnitude earthquake and a 48-foot-high (15 m) tsunami. Oceanfront property was washed off its foundations in Punaluu. Two deaths were reported at Halape, and 19 other people were injured. 
The island suffered tsunami damage from earthquakes in Alaska on 1 April 1946, and in Chile on 23 May 1960. Downtown Hilo was severely damaged by both tsunamis, with many lives lost. Just north of Hilo, Laupāhoehoe lost 16 schoolchildren and five teachers in the tsunami of 1946. 
In March 2011, a 9.0 magnitude earthquake off the east coast of Japan again created a tsunami that caused minor damage in Hawaiʻi. The estimated damage to public buildings alone was about US$3 million.  In the Kona area this tsunami washed a house into Kealakekua Bay, destroyed a yacht club and tour boat offices in Keauhou Bay, caused extensive damage in Kailua Kona, flooded the ground floor of the King Kamehameha Hotel,  and permanently closed the Kona Village Resort. 
In early May 2018, hundreds of small earthquakes were detected on Kīlauea's East rift zone, leading officials to issue evacuation warnings. On 3 May 2018, the volcano erupted in Puna after a 5.0 earthquake earlier in the day, causing evacuations of the Leilani Estates and Lanipuna Gardens subdivisions.   A seemingly related 5.3 magnitude quake and a subsequent 6.9 magnitude earthquake occurred on 4 May.  
Vog (volcanic fog) can envelop the island of Hawaiʻi when Kilauea Volcano is active. Since the termination of volcanic activity in September 2018, the vog has largely disappeared on the west side of the island.  The gas plumes of the Kīlauea Volcano create a blanket of vog which the dominant trade winds mostly deflect toward the Kona coast on the west side of the island of Hawaiʻi. Vog contains chemicals that can damage the environment and the health of plants, humans, and other animals. Most of the aerosols are acidic and of a size where they can remain in the lungs to damage them and impair function. Flu-like symptoms and general lethargy are reported, and are especially pronounced in people with respiratory conditions.    
- Ala Kahakai National Historic Trail
- Hakalau Forest National Wildlife Refuge
- Hawaiʻi Volcanoes National Park
- Honokōhau Settlement and Kaloko-Honokōhau National Historical Park
- Kohala Historical Sites State Monument ( Mookini Heiau)
- Kona Forest National Wildlife Refuge
- Puʻuhonua o Hōnaunau National Historical Park
- Puʻukoholā Heiau National Historic Site
Sugarcane was the backbone of the island of Hawaiʻi's economy for more than a century. In the mid-20th century, sugarcane plantations began to downsize, and in 1995 the last plantation closed. [ citation needed]
Most of the island's economy is based on tourism, centered primarily in resort areas on the western coast of the island in the North Kona and South Kohala districts. More recently, Hawaiʻi Island has become a focus for sustainable tourism.[ citation needed]
Diversified agriculture is a growing sector of the economy. Major crops include macadamia nuts, papaya, flowers, tropical and temperate vegetables, and coffee beans. Only coffee grown in the Kona District of this island may be branded Kona coffee. The island's orchid agriculture is the largest in the state, and resulted in the unofficial nickname "The Orchid Isle". The island is home to one of the United States' largest cattle ranches: Parker Ranch, on 175,000 acres (708 km2) in Waimea. The island is also known for astronomy, with numerous telescopes operated on the summit of Mauna Kea, where atmospheric clarity is excellent and there is little light pollution.[ citation needed]
NELHA (Natural Energy Laboratory of Hawaii Authority), a 675-acre (273 ha) state developed site, is a green economic development ocean science and technology park on the west side of the island. It provides resources and facilities for energy and ocean-related research, education, and commercial activities in an environmentally sound and culturally sensitive manner. Business tenants on this coastal site include microalgae farms, aquaculture, solar technology and marine biotech. Tenants have access to three sets of pipelines delivering deep-sea water from a depth of up to 3,000 feet (910 m), as well as pristine sea surface water and almost constant sunshine. A 2012 study by the University of Hawaiʻi Economic Research Organization (UHERO) found the total economic impact of activities at NELHA was $87.7 million and created 583 jobs. 
- State highways 19 & 190, the northern route via Waimea
- State highway 11, the southern route via Hawaiʻi Volcanoes National Park
- Saddle Road (aka the Daniel K. Inouye Memorial highway), passing between Mauna Loa and Mauna Kea).
There are presently three Hawaii Scenic Byways on the island of Hawaii:
- Mamalahoa Kona Heritage Center
- Royal Footsteps Along the Kona Coast
- Kaʻu Scenic Byway – The Slopes of Mauna Loa
Two commercial airports serve Hawaiʻi Island:
There is also:
- Akaka Falls, one of the tallest waterfalls on the island.
- Amy B. H. Greenwell Ethnobotanical Garden houses many endangered endemic plants.
- East Hawaiʻi Cultural Center
- Hawaiʻi Tropical Botanical Garden
- Hawaiʻi Volcanoes National Park, comprising the active volcanoes Kīlauea and Mauna Loa
- Huliheʻe Palace, a royal palace in Kailua-Kona
- ʻImiloa Astronomy Center of Hawaiʻi in Hilo
- Ka Lae, the southernmost point in the United States
- Laupāhoehoe Train Museum
- Lyman House Memorial Museum in Hilo
- Manuka State Wayside Park
- Mauna Kea Observatories
- Nani Mau Gardens
- Onizuka Center for International Astronomy
- Pacific Tsunami Museum overlooking Hilo Bay
- Pana'ewa Rainforest Zoo in Hilo
- Pua Mau Place Arboretum and Botanical Garden
- Puʻuhonua o Hōnaunau National Historical Park
- Puʻukoho'ā Heiau National Historic Site, the site of one of the most significant heiau in Hawaiʻi
- Rainbow Falls State Park
- Sadie Seymour Botanical Gardens
- Umauma Falls
- University of Hawaiʻi at Hilo Botanical Gardens
- Waipiʻo Valley
- Wao Kele o Puna
- World Botanical Gardens
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- Media related to Hawaii (island) at Wikimedia Commons