AS06-02-938 (6 April 1968) --- During the second revolution of the National Aeronautics and Space Administration's Apollo 6 spacecraft, this photograph of Senegal and Mauritania was taken at an altitude of 125 nautical miles. The predominant feature is the valley of the Senegal River (flowing to lower right). Lake Rkiz is to the left of the river in Mauritania. The Trarza Scrub Hills, a large area of elongated, fixed dunes, is in the lower left of the print. The land area seen in this photo is approximately 10,000 square miles or about the size of the state of Maryland. The photo was made one hour and fifty minutes after liftoff using a J.A. Maurer model 220G camera with Eastman Kodak SO-121 high resolution aerial Ektachrome film (exposure setting of f: 5.6 at 1/500 sec.).