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Big Maria Mountains Wilderness
The 45,000 acre Big Maria Mountains Wilderness can be found north of Blythe in California near the the Colorado River and the border with Arizona. It rises to only about 3300 ft. The terrain varies from gently sloping bajadas to sharp, crumbling peaks and steep canyons.
The Rice Valley Wilderness borders the northern end of the park on the south side of a large wash called Big Wash. Bajadas and steep canyons carry debris ever downhill while providing homes for many species of wildflowers and cactus such as Foxtail cactus (Coryphantha alversonii.) and California barrel cactus (Ferocactus cylindraceus).