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		01965-01-011965		Grant	A channel cut by the Ancient River Warren during the Ice Age.
2	Bear Butte		01965-01-011965		Meade	A cone-shaped mass of igneous rock standing alone 1,300 feet (400 m) above the surrounding plains.
3	Bijou Hills		01976-01-011976		Charles Mix	An excellent example of an erosional remnant of soft clays and shales capped by a channel sandstone and quartzite.
4	Buffalo Slough		01980-01-011980		Lake	Excellent examples of a prairie pothole with native emergent vegetation, and a native bluestem prairie.
5	The Castles		01976-01-011976		Harding	Steep-walled, flat-topped buttes standing 200 to 400 feet (61 to 120 m) above the surrounding prairie.
6	Cathedral Spires and Limber Pine Natural Area		01976-01-011976		Custer	An excellent, rare example of joint-controlled weathering of granite.
7	Cottonwood Slough- Dry Run		01975-01-011975		Roberts	A completely undisturbed wetland complex including potholes, streams, shallow open water, lakes, and marsh.
8	Fort Randall Eagle Roost		01967-01-011967		Gregory	A prime winter roosting area for bald and golden eagles.
9	Lake Thompson		01975-01-011975		Kingsbury	Contains a large undisturbed and unmanipulated marsh, an outstanding waterfowl breeding and resting area.
10	Mammoth Site of Hot Springs		01980-01-011980		Fall River	One of the largest concentrations of mammoth remains in the United States.
11	Red Lake		01975-01-011975		Brule	One of the largest remaining natural and unmanipulated prairie pothole lakes.
12	Sica Hollow		01967-01-011967		Marshall	Displays many facets of natural history.
13	Snake Butte		01967-01-011967		Jackson	Illustrates one of two types of sand calcite deposits in the world.