The entire region south of the Poachie Range, and its two mountain ranges bordered westwards, the Rawhide and Bill Williams Mountain, and bordered on the Bill Williams River northern bank — is the Maria fold and thrust belt.

The thrust belt is a geographic and geologic region at the convergence of these neighboring mountain ranges, rivers, the Alamo Lake, as well as other plains and valleys.

The Poachie Range is approximately 30 mi long slightly trending northwest by southeast, with no central ridgeline.

Signal, Arizona with only unimproved road access is at the northwest foothills, about 10 mi from U.S. Route 93.

Both the Big Sandy and Santa Maria Rivers are mostly contained in the wilderness, as well as People's Canyon in the east.