Definition: The Black Rock is a conspicuous volcanic feature rising above the flat plain of the Black Rock Desert playa. It was first described by Frémont in 1844, and subsequently used as a landmark by emigrants headed for Oregon and California on the Applegate-Lassen Trail. The annual Burning Man festival is held on the Black Rock playa. A large area around the desert is public land administered as the Black Rock Desert High Rock Canyon Emigrant Trails National Conservation Area.
The Black Rock Desert playa is one of the flattest places on earth.