The terrain within the Big Maria Mountains Wilderness varies from gently sloping bajadas to numerous rough, craggy peaks disjointed by steep canyons. The northern boundary lies south of a major drainage known as Big Wash. The eastern and western boundaries follow powerlines and contours along the base of the mountains. Foxtail and California barrel cacti dot the landscape, and a deer herd relies on the wash habitat for survival.
Directions from Blythe, CA: Big Maria Mountains Wilderness is located in Riverside County, 10 miles north of Blythe. The wilderness can be accessed by California State Highway 95 from the east, and by Interstate 10 from the southwest via Midland Road and powerline roads. A four-wheel-drive vehicle is recommended.