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The far side of the Moon is depicted in colors of blue, purple, green, yellow, and red. Blue darkening to purple is centered in a large portion of the middle of the Moon, showing the extent of the South Pole-Aitken Basin. Green and yellow surrounds it, with blue usually highlighting craters which are in turn surrounded by green. Red indicates high elevations and is primarily found toward the top of the Moon image.

South Pole-Aitken topographic

The South Pole-Aitken Basin on the lunar far side is one of the largest and oldest impact features in the solar system. It's easily seen in the elevation data. The low center is dark blue and purple. Mountains on its edge, remnants of outer rings, are red and yellow.

Image Credit: NASA/GSFC/University of Arizona
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