Ecuador and the Galápagos, July 23 - August 7, 2007 / 20070805z_IsabelaVolcanEcuador_CollapsedCaldera Ruth Milner, rmilner plus web at bookofmarvels dot net 12/21/2007

Collapsed Caldera, Isabela Toward the northern tip of Isabela is this huge caldera which has partially collapsed into the sea.