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This oblique photograph looks north across the southern part of Mare Imbrium. The low sun light angle and long shadows accentuate details of the surface structure. The surface in this area is mare basalt. The prominent ridges running from upper left to lower right are wrinkle ridges, formed when the mare surface sagged under the weight of several kilometers of basalt. Similaar wrinkle ridges are seen in other mare regions, including Mare Serenitatis and Mare Humorum. The prominent peak in the lower left is Mt. Lahire, which is 1.7 kilometers high. This photo was taken by the crew of Apollo 15.
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