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[]: 11
[Name]: Red Lake
[Image]:
[Date]: 1975
[Location]: 43°43′35″N 99°13′31″W / 43.726352°N 99.22518°W / 43.726352; -99.22518 (Red Lake)
[County]: Brule
[Ownership]: state
[Description]: One of the largest remaining natural and unmanipulated prairie pothole lakes. -
[]: 4
[Name]: Buffalo Slough
[Image]:
[Date]: 1980
[Location]: 43°52′28″N 96°56′20″W / 43.874308°N 96.939013°W / 43.874308; -96.939013 (Buffalo Slough)
[County]: Lake
[Ownership]: state
[Description]: Excellent examples of a prairie pothole with native emergent vegetation, and a native bluestem prairie. -
[]: 5
[Name]: The Castles
[Image]:
[Date]: 1976
[Location]: 45°31′39″N 103°10′15″W / 45.527583°N 103.170965°W / 45.527583; -103.170965 (The Castles)
[County]: Harding
[Ownership]: federal (Custer National Forest)
[Description]: Steep-walled, flat-topped buttes standing 200 to 400 feet (61 to 122 m) above the surrounding prairie. -
[]: 13
[Name]: Snake Butte
[Image]:
[Date]: 1967
[Location]:
[County]: Jackson
[Ownership]: tribal (Oglala Sioux)
[Description]: Illustrates one of two types of sand calcite deposits in the world. -
[]: 7
[Name]: Cottonwood Slough- Dry Run
[Image]:
[Date]: 1975
[Location]: 44°57′25″N 97°11′37″W / 44.957077°N 97.193497°W / 44.957077; -97.193497 (Cottonwood Slough- Dry Run)
[County]: Roberts
[Ownership]: mixed- state, private
[Description]: A completely undisturbed wetland complex including potholes, streams, shallow open water, lakes, and marsh. -
[]: 3
[Name]: Bijou Hills
[Image]:
[Date]: 1976
[Location]: 43°31′04″N 99°08′50″W / 43.517778°N 99.147222°W / 43.517778; -99.147222 (Bijou Hills)
[County]: Charles Mix
[Ownership]: private
[Description]: An excellent example of an erosional remnant of soft clays and shales capped by a channel sandstone and quartzite.
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