List of National Natural Landmarks in South Dakota

There are 13 National Natural Landmarks in South Dakota.

Bear Butte

Bijou Hills

Lake Thompson

Mammoth Site of Hot Springs

Cathedral Spires

Sica Hollow State Park

Buffalo Slough

The Castles

Cottonwood Slough-Dry Run

Red Lake

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South Dakota National Natural Landmarks (clickable map)

Name	Image	Date	Location	County	Ownership	Description
Ancient River Warren Channel		1965		Grant	mixed- state, private	A channel cut by the Ancient River Warren during the Ice Age.
Bear Butte		1965	44°28′33″N103°25′37″W / 44.475833°N 103.426944°W / 44.475833; -103.426944 (Bear Butte)	Meade	mixed- state, tribal, private	A cone-shaped mass of igneous rock standing alone 1,300 feet (400 m) above the surrounding plains.
Bijou Hills		1976	43°31′04″N99°08′50″W / 43.517778°N 99.147222°W / 43.517778; -99.147222 (Bijou Hills)	Charles Mix	private	An excellent example of an erosional remnant of soft clays and shales capped by a channel sandstone and quartzite.
Buffalo Slough		1980	43°52′28″N96°56′20″W / 43.874308°N 96.939013°W / 43.874308; -96.939013 (Buffalo Slough)	Lake	state	Excellent examples of a prairie pothole with native emergent vegetation, and a native bluestem prairie.
The Castles		1976	45°31′39″N103°10′15″W / 45.527583°N 103.170965°W / 45.527583; -103.170965 (The Castles)	Harding	federal (Custer National Forest)	Steep-walled, flat-topped buttes standing 200 to 400 feet (61 to 122 m) above the surrounding prairie.
Cathedral Spires and Limber Pine Natural Area		1976	43°50′28″N103°32′40″W / 43.841111°N 103.544444°W / 43.841111; -103.544444 (Cathedral Spires and Limber Pine Natural Area)	Custer	state (Custer State Park)	An excellent, rare example of joint-controlled weathering of granite.
Cottonwood Slough-Dry Run		1975	44°57′25″N97°11′37″W / 44.957077°N 97.193497°W / 44.957077; -97.193497 (Cottonwood Slough-Dry Run)	Roberts	mixed- state, private	A completely undisturbed wetland complex including potholes, streams, shallow open water, lakes, and marsh.
Fort Randall Eagle Roost		1967	43°01′28″N98°37′27″W / 43.0244°N 98.6242°W / 43.0244; -98.6242 (Fort Randall Eagle Roost)	Gregory	federal (Missouri National Recreational River)	A prime winter roosting area for bald and golden eagles.
Lake Thompson		1975	44°17′06″N97°27′43″W / 44.285°N 97.461944°W / 44.285; -97.461944 (Lake Thompson)	Kingsbury	state	Contains a large undisturbed and unmanipulated marsh, an outstanding waterfowl breeding and resting area.
The Mammoth Site		1980	43°25′29″N103°28′59″W / 43.42471°N 103.48313°W / 43.42471; -103.48313 (The Mammoth Site)	Fall River	private	One of the largest concentrations of mammoth remains in the United States.
Red Lake		1975	43°43′35″N99°13′31″W / 43.726352°N 99.22518°W / 43.726352; -99.22518 (Red Lake)	Brule	state	One of the largest remaining natural and unmanipulated prairie pothole lakes.
Sica Hollow		1967	45°44′31″N97°14′33″W / 45.741944°N 97.2425°W / 45.741944; -97.2425 (Sica Hollow)	Marshall	state	Displays many facets of natural history.
Snake Butte		1967		Jackson	tribal (Oglala Sioux)	Illustrates one of two types of sand calcite deposits in the world.

See also

• List of National Historic Landmarks in South Dakota