Global Volcanism Program | Image GVP-04257
The dark lava flow at the lower right, seen here in June 1970, originated from Crater A on the lower western flank of Arenal in September 1968. Gas plumes rise from the B and C craters at the summit.
Photo by William Melson, 1970 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.