This photograph shows the Big Obsidian Flow that forms part of Newberry Crater. Located in Central Oregon, Newberry Crater is a Central feature of the Newberry National Volcanic Monument.

Over many millennia, the volcano erupted continuously, forming the various lava flows, cinder cones, fissures, and lakes that comprise the national monument today. Geologically still active, Newberry Volcano last erupted in 640 A.D., creating the Big Obsidian Flow which covers 2.8 sq km.