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.