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Nine Mile Knoll &
St. Anthony Sand Dunes
Designated 1987, 1985
Medicine Lodge RMP
42,343 acres; 1,825 acres
The Nine Mile Knoll ACEC is located 6 miles west and northwest of the town of St. Anthony and encompasses all of the St. Anthony sand dunes found on public land, along with 36 square miles of vegetated desert
to the south and southwest of the dunes.
The St. Anthony Sand Dunes RNA lies completely within the ACEC boundary. The portion of the ACEC covered with active dunes is also designated a wilderness study area (WSA) and a special recreation management area. The dunes have also been evaluated
for National Natural Landmark designation.