Global Volcanism Program | Image GVP-04738
The broad shield volcano of Sierra Negra at the southern end of Isabela Island rises above a sea of clouds across from the tephra-mantled caldera rim of Fernandina volcano. Sierra Negra is the largest, but lowest-angle shield volcano on Isabela. The summit of the volcano contains a shallow 7 x 10.5 km caldera that is the largest of the Galápagos Islands. Sierra Negra is one of the most active of the Isabela Island volcanoes.
Photo by Lee Siebert, 1978 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.