Earth Observations taken by the Expedition 21 Crew

ISS021-E-008371 (16 Oct. 2009) --- The city of Arequipa, Peru is featured in this image photographed by an Expedition 21 crew member on the International Space Station. Several Latin American cities have grown up on the flanks of active volcanoes. The city center of Arequipa, Peru lies only 17 kilometers away from the summit of El Misti volcano (partially out of frame at left); the gray urban area is bordered by green agricultural fields. With almost one million residents in 2009, it is the second city of Peru in terms of population. Much of the building stone for Arequipa, known locally as sillar, is quarried from nearby pyroclastic flow deposits that are white in color. Arequipa is known as ?the White City? because of the prevalence of this building material. The Chili River extends northeastwards from the city center, and flows through a canyon (left) between El Misti volcano and Nevado Chachani to the north.