List of National Natural Landmarks in South Dakota

From List of National Natural Landmarks, these are the National Natural Landmarks in South Dakota.

	Name	Image	Date	Location	County	Description
1	Ancient River Warren Channel		1965		Grant	A channel cut by the Ancient River Warren during the Ice Age.
2	Bear Butte		1965		Meade	A cone-shaped mass of igneous rock standing alone 1,300 feet (400 m) above the surrounding plains.
3	Bijou Hills		1976		Charles Mix	An excellent example of an erosional remnant of soft clays and shales capped by a channel sandstone and quartzite.
4	Buffalo Slough		1980		Lake	Excellent examples of a prairie pothole with native emergent vegetation, and a native bluestem prairie.
5	The Castles		1976		Harding	Steep-walled, flat-topped buttes standing 200 to 400 feet (61 to 122 m) above the surrounding prairie.
6	Cathedral Spires and Limber Pine Natural Area		1976		Custer	An excellent, rare example of joint-controlled weathering of granite.
7	Cottonwood Slough- Dry Run		1975		Roberts	A completely undisturbed wetland complex including potholes, streams, shallow open water, lakes, and marsh.
8	Fort Randall Eagle Roost		1967		Gregory	A prime winter roosting area for bald and golden eagles.
9	Lake Thompson		1975		Kingsbury	Contains a large undisturbed and unmanipulated marsh, an outstanding waterfowl breeding and resting area.
10	Mammoth Site of Hot Springs		1980		Fall River	One of the largest concentrations of mammoth remains in the United States.
11	Red Lake		1975		Brule	One of the largest remaining natural and unmanipulated prairie pothole lakes.
12	Sica Hollow		1967		Marshall	Displays many facets of natural history.
13	Snake Butte		1967		Jackson	Illustrates one of two types of sand calcite deposits in the world.