The northeastern end of Umnak Island, occupied by Okmok caldera, as viewed from space. This photograph is mission ISS011, Roll E, Frame 13562 from Image Science and Analysis Laboratory, NASA-Johnson Space Center. "The Gateway to Astronaut Photography of Earth." and is available at http://eol.jsc.nasa.gov/scripts/sseop/photo.pl?mission=ISS011&roll=E&frame=13562