From List of National Natural Landmarks, these are the National Natural Landmarks in Nebraska. There are 5 in total

Ashfall Fossil Beds

Fontenelle Forest

Nebraska Sand Hills

Valentine National Wildlife Refuge

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Nebraska National Natural Landmarks (clickable map)

	Name	Image	Date	Location	County	Ownership	Description
1	Ashfall Fossil Beds		2006	Orchard 42°26′26″N 98°08′53″W / 42.440556°N 98.148083°W / 42.440556; -98.148083 (Ashfall Fossil Beds)	Antelope	state historical park	A rare example of a lagerstätten, a thick bed of volcanic ash, contains hundreds of extraordinarily complete skeletons of extinct mammals.
2	Dissected Loess Plains		1987		Lincoln	mixed- state, private	Eroded canyons and deep valleys in loess deposits over 200 feet (61 m) thick
3	Fontenelle Forest		1964	41°10′48″N 95°55′04″W / 41.18°N 95.917778°W / 41.18; -95.917778 (Fontenelle Forest)	Sarpy	private	The largest virgin forest in Nebraska.
4	Nebraska Sand Hills		1984	42°08′N 102°11′W / 42.13°N 102.19°W / 42.13; -102.19 (Nebraska Sand Hills)	Nebraska	mixed- state, private	The largest sand dunes complex in the Western Hemisphere.
5	Valentine National Wildlife Refuge		1976	42°29′37″N 100°34′22″W / 42.493611°N 100.572778°W / 42.493611; -100.572778 (Valentine National Wildlife Refuge)	Cherry	federal	Sandhill tall grass prairie ecosystem unique to the central Great Plains.