The range, which lies in a north-south direction, is located just north of Interstate 8, and east of the Manzanita Indian Reservation.

The In-Ko-Pah Mountains consist of faulted granitic intrusive bedrock, weathered into dramatic piles of residual boulders.

The local granodiorite is naturally a very light color, weathering over centuries into a reddish-orange desert varnish.

The boulders can be examined closer at the Desert View Tower, a historic roadside structure, that includes a boulder park with a number of massive Depression-era sculptures carved in the local rocks.

Camping among the rocks is available in the McCain Valley Recreational Area, located off Interstate 8 near the town of Boulevard.