Mare Anguis

Mare Anguis (the "serpent sea") is a lunar mare located on the near side of the Moon, about 150 miles in diameter. 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.