List of National Natural Landmarks in South Dakota

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

NameImageDateLocationCountyOwnershipDescription
1 Ancient River Warren Channel 1965 Grant mixed- state, privateA channel cut by the Ancient River Warren during the Ice Age.
2 Bear Butte BEAR BUTTE.jpg 1965 44°28′33″N103°25′37″W / 44.475833°N 103.426944°W / 44.475833; -103.426944 (Bear Butte) Meade mixed- state, tribal, privateA cone-shaped mass of igneous rock standing alone 1,300 feet (400 m) above the surrounding plains.
3 Bijou Hills 1976 43°31′04″N99°08′50″W / 43.517778°N 99.147222°W / 43.517778; -99.147222 (Bijou Hills) Charles Mix privateAn excellent example of an erosional remnant of soft clays and shales capped by a channel sandstone and quartzite.
4 Buffalo Slough 1980 43°52′28″N96°56′20″W / 43.874308°N 96.939013°W / 43.874308; -96.939013 (Buffalo Slough) Lake stateExcellent examples of a prairie pothole with native emergent vegetation, and a native bluestem prairie.
5 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.
6 Cathedral Spires and Limber Pine Natural Area The Needles in Custer State Park, South Dakota.jpg 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.
7 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, privateA completely undisturbed wetland complex including potholes, streams, shallow open water, lakes, and marsh.
8 Fort Randall Eagle Roost 1967 Gregory federal (Missouri National Recreational River)A prime winter roosting area for bald and golden eagles.
9 Lake Thompson 1975 44°17′06″N97°27′43″W / 44.285°N 97.461944°W / 44.285; -97.461944 (Lake Thompson) Kingsbury stateContains a large undisturbed and unmanipulated marsh, an outstanding waterfowl breeding and resting area.
10 The Mammoth Site Mammoth Site Hot Springs.jpg 1980 43°25′29″N103°28′59″W / 43.42471°N 103.48313°W / 43.42471; -103.48313 (The Mammoth Site) Fall River privateOne of the largest concentrations of mammoth remains in the United States.
11 Red Lake 1975 43°43′35″N99°13′31″W / 43.726352°N 99.22518°W / 43.726352; -99.22518 (Red Lake) Brule stateOne of the largest remaining natural and unmanipulated prairie pothole lakes.
12 Sica Hollow 1967 45°44′31″N97°14′33″W / 45.741944°N 97.2425°W / 45.741944; -97.2425 (Sica Hollow) Marshall stateDisplays many facets of natural history.
13 Snake Butte 1967 Jackson tribal (Oglala Sioux)Illustrates one of two types of sand calcite deposits in the world.

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