From List of National Natural Landmarks, these are the National Natural Landmarks in South Dakota.
{{clear}}{{South Dakota NNLs map}} | Name | Image | Date | Location | County | Ownership | Description | | 1 | Ancient River Warren Channel | 1965}} | Grant | mixed- state, private | A channel cut by the Ancient River Warren during the Ice Age. |
| 2 | Bear Butte | 1965}} | 44.475833|-103.426944|type:landmark|display=inline|name=Bear Butte}} | Meade | mixed- state, tribal, private | 1300|ft|m}} above the surrounding plains. |
| 3 | Bijou Hills | 1976}} | 43.517778|-99.147222|type:landmark|display=inline|name=Bijou Hills}} | Charles Mix | private | An excellent example of an erosional remnant of soft clays and shales capped by a channel sandstone and quartzite. |
| 4 | Buffalo Slough | 1980}} | 43.874308|-96.939013|type:landmark|display=inline|name=Buffalo Slough}} | Lake | state | Excellent examples of a prairie pothole with native emergent vegetation, and a native bluestem prairie. |
| 5 | The Castles | 1976}} | 45.527583|-103.170965|type:landmark|display=inline|name=The Castles}} | Harding | federal (Custer National Forest) | 200|to|400|ft|m}} above the surrounding prairie. |
| 6 | Cathedral Spires and Limber Pine Natural Area | 1976}} | 43.841111|-103.544444|type:landmark|display=inline|name=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}} | 44.957077|-97.193497|type:landmark|display=inline|name=Cottonwood Slough- Dry Run}} | Roberts | mixed- state, private | A 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}} | 44.285|-97.461944|type:landmark|display=inline|name=Lake Thompson}} | Kingsbury | state | Contains a large undisturbed and unmanipulated marsh, an outstanding waterfowl breeding and resting area. |
| 10 | Mammoth Site of Hot Springs | 1980}} | 43.42471|-103.48313|type:landmark|display=inline|name=Mammoth Site of Hot Springs}} | Fall River | private | One of the largest concentrations of mammoth remains in the United States. |
| 11 | Red Lake | 1975}} | 43.726352|-99.22518|type:landmark|display=inline|name=Red Lake}} | Brule | state | One of the largest remaining natural and unmanipulated prairie pothole lakes. |
| 12 | Sica Hollow | 1967}} | 45.741944|-97.2425|type:landmark|display=inline|name=Sica Hollow}} | Marshall | state | Displays 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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