Mare Nectaris /ˈnɛktərɪs/ (Latin nectaris, the "Sea of Nectar") is a small lunar mare or sea (a volcanic lava plain noticeably darker than the rest of the Moon's surface) located south of Mare Tranquillitatis southwest of Mare Fecunditatis, on the near side of the moon. Montes Pyrenaeus borders the mare to the east and Sinus Asperitatis fuses to its northwestern edge. It is 84,000 square kilometers in size. * Basin of Mare Nectaris (LRO image mosaic). Rupes Altai is a thin bright streak in the lower left * Topographic map of the same area (LRO data) * Gravity map based on GRAIL *