In a landscape normally locked down tighter than my grandma’s Tupperware cabinet, this specific ridge stands alone as Arizona’s only legal rock-collecting zone inside the refuge. The Kofa National Wildlife RefugeCovering roughly 666,000 acres of raw Sonoran Desert in La Paz and Yuma counties, the Kofa National Wildlife Refuge is one of Arizona’s most striking wilderness areas. Smart Camping And Safety TipsCamping inside the Kofa National Wildlife Refuge is a wonderful way to extend your Crystal Hill adventure without spending a single dollar on a campground fee. Planning a combined trip between Quartzsite and the Kofa Refuge makes excellent geographic sense and gives you a richly layered desert experience. The refuge headquarters for the Kofa National Wildlife Refuge is located in Yuma, Arizona, and the staff there can provide updated road conditions, wildlife sightings, and any current regulations before your trip.