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About Castles National Landmark

Castles National Landmark is located in the Slim Buttes land unit in South Dakota. The Castles are a massive sandstone remnant which originated as a volcanic ash deposit and resemble a medieval castle. This natural wonder also serves as a habitat for one of North America's largest populations of Merlin falcons. One of two National Natural Landmarks on the Sioux R.D.

USDA Forest Service
Castles National Landmark is located in Montana
44.9555 N
-111.0704 W
Get Directions
From Buffalo, SD take Hwy 20 approximately 20 miles to Forest Road 3126. Turn right into Reva Gap Campground. The south end of the campground has an information board and a nice view of Castles National Landmark.
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