This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) picture obtained in April 2003 shows the margin of a large lava flow south of Tharsis near 33.5°S, 137.5°W. Some of the lava broke out and poured into an adjacent crater formed by meteor impact. The picture covers an area about 3 km (1.9 mi) wide; the crater is more than twice the size of the famous Meteor Crater in northern Arizona, U.S.A. Sunlight illuminates the scene from the upper left.