Global Volcanism Program | Image GVP-03662
The forested lava flow extending across the valley floor in the center of the photo is from Volcán Malpais in the Mascota Volcanic Field, and may be only a few thousand years old. The flow is seen here looking west across the graben floor from Volcán Molcajete.
Photo by Jim Luhr, 1985 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.