The Desert National Wildlife Refuge was established May 20, 1936, and encompasses 1.5 million acres of the diverse Mojave Desert in southern Nevada. It is the largest National Wildlife Refuge in the lower 48 states. The Refuge contains six major mountain ranges, the highest rising from 2,500-foot valleys to nearly 10,000 feet. Annual rainfall ranges from less than four inches on the valley floors to over fifteen inches on the highest peaks. Be sure to check out their brand new visitor center, Open Thursdays through Sundays (and select holidays) from 8am to 4:30pm!