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Mare Anguis (the "serpent sea") is a lunar mare located on the near side of the Moon, about 150 kilometers in diameter.[1] Located within the Crisium basin, Mare Anguis is a part of the Nectarian System, meaning that it was formed during the Nectarian time period. Like most mare, the surface of Mare Anguis is dark, indicating that it has been filled with volcanic basalt.

Mare Anguis
Mare Anguis.jpg
Mare Anguis is the dark patch in the middle of this photo. The crater in the left center of the photo is Eimmart, and is at the northwestern tip of Mare Anguis. The dark patch in the lower left corner is the northeastern edge of Mare Crisium.
Coordinates22°36′N 67°42′E / 22.6°N 67.7°E / 22.6; 67.7Coordinates: 22°36′N 67°42′E / 22.6°N 67.7°E / 22.6; 67.7
Diameter146 km (91 mi)[1]
EponymSerpent Sea
Oblique view from Apollo 17


  1. ^ a b "Mare Anguis". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.