Ubehebe Crater is a maar volcano located off Scotty&#039;s Castle Road in Death Valley National Park, California. The colorful strata visible in the wall of the crater are sedementary deposits of the Navadu Formation. Ubehebe is the largest in a cluster of maar volcanoes located in this area. The explosions that formed these craters were caused by steam created when a small amount of basaltic magma encountered subsurface water.