Caldera of the Galapagos Islands, Ecuador – January 27th, 20100.3S 91.5W
The ring-like structures on Isabela Island (right) and Fernandina Island (bottom), in this orthorectified image of the Galapagos Islands, are volcanic caldera. Isabela Island, the largest of the group, was formed by several volcanoes. Here, Volcán Wolf (above) and Volcán Darwin (below) can be observed.
Fernandina Island is an active shield volcano and youngest of the Galápagos Islands. The summit caldera is about 6.5 km (4 miles) wide. The caldera underwent a collapse in 1968, when parts of the caldera floor dropped 350 meters. A small lake has intermittently occupied the northern caldera floor, most recently in 1988.