A broad frozen lava lake rises almost to the rim of the 800 x 300 m wide summit crater of Hell's Half Acre shield volcano, the easternmost of the young basaltic lava fields of the Snake River Plain. The 300 x 800 m wide lava lake is seen from the summit of the low shield volcano, with East Butte and Middle Butte visible to the west on the upper right horizon. Dominantly pahoehoe lava flows were erupted from a 3-km-long, NW-SE trending vent system in the NW part of Hells Half Acre lava field about 5200 years ago.

Photo by Lee Siebert, 2002 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Hell's Half Acre