The Castles (South Dakota)
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LocationSlim Buttes land unit, Custer National Forest, Harding County, South Dakota, United States[1]
EstablishedNational Natural Landmark
| The Castles | |
|---|---|
 Interactive map of The Castles | |
| Location | Slim Buttes land unit, Custer National Forest, Harding County, South Dakota, United States[1] |
| Coordinates | 45°31′39″N 103°10′15″W / 45.527583°N 103.170965°W |
| Established | National Natural Landmark |
| Designated | 1976 |
The Castles is a butte formation in Harding County, South Dakota, United States. It is a place of geological and historical interest, being located adjacent to the site of the Battle of Slim Buttes. A 940-acre portion of this site was listed in 1976 as a National Natural Landmark as a volcanic ash deposit that stands substantially higher than the surrounding plateau.[2] The site is located within the Slim Buttes land parcel of the Custer National Forest, a federal landholding.[1]