Beaver Dam Mountains Wilderness is a protected borderland in northwestern Arizona and southwestern Utah where the Beaver Dam Mountains span the Colorado Plateau. Covering about 18,667 acres and managed by the Bureau of Land Management, it includes jagged mountains, a gently sloping alluvial plain, and a 13-mile stretch of the Virgin River Gorge. The area contains some of Utah’s lowest-elevation land and has a distinctive Mojave Desert character marked by widespread Joshua trees. Its wildlife includes desert bighorn sheep, the threatened desert tortoise, and many raptors. U.S. Congress designated it wilderness in 1984, preserving a notably undeveloped landscape.