# List of National Natural Landmarks in South Dakota

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There are 13 National Natural Landmarks in South Dakota.
| Name | 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″N 103°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″N 99°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″N 96°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″N 103°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″N 103°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″N 97°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″N 98°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″N 97°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″N 103°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″N 99°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″N 97°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. |