Mannhan Canyon is a valley located in Pennington County, South Dakota. It appears on the Hermosa NW USGS 7.5-minute topographic quadrangle. The nearest populated place is Ajax, approximately 2.9 miles to the ENE.
Pennington County · South Dakota
Mannhan Canyon is a valley located in Pennington County, South Dakota. It appears on the Hermosa NW USGS 7.5-minute topographic quadrangle. The nearest populated place is Ajax, approximately 2.9 miles to the ENE.