The rugged surface of the Jom-Bolok lava flow fills the valley of the Oka River. The massive Holocene lava flow traveled 70 km from its source, a scoria cone of the Jom-Bolok volcanic field near the Oka Plateau west of Lake Baikal.

Photo by Jim Luhr, 1991 (Smithsonian Institution).

Keywords: lava flow

Jom-Bolok