The Sea of Nectar (Mare Nectaris) is a small lunar mare or sea (a volcanic lava plain noticeably darker than the rest of the moon's surface) located between the Sea of Tranquillity (Mare Tranquillatis) and the Sea of Fecundity (Mare Fecunditatis). Montes Pyrenaeus borders the mare to the west and the large crater near the south center of the mare is known as Rosse. The Lunar maria (singular: mare, pronounced MAH-ray) are large, dark, basaltic plains on Earths Moon, formed by ancient basaltic flood eruptions caused by extremely large meteoroid impacts. ... The term Luna can refer to the Earths Moon. ... The Sea of Tranquility of the Moon. ... Mare Fecunditatis (the Sea of Fecundity or Sea of Fertility) is a lunar mare 909 miles in diameter. ... The Montes Pyrenaeus are a mountain range on the Moon, bordering Mare Nectaris. ... Rosse is a bowl-shaped lunar impact crater located in the southern part of Mare Nectaris. ...

Geology

The mare material is approximately 1000m in depth, and mainly of the Nectarian and Lower Imbrian epochs, with the mare material of the Upper Imbrian epoch. The crater Theophilus on the northeastern side of the mare is of the Eratosthenian epoch. Thus, the crater is younger than the mare to its southeast. The Nectarian Period of the lunar geologic timescale runs from 3920 million years ago to 3850 million years ago. ... In the Lunar geologic timescale, the Lower Imbrian epoch occurred between 3850 million years ago to about 3800 million years ago. ... Theophilus is a prominent lunar impact crater that lies between Sinus Asperitatis in the north and Mare Nectaris to the southeast. ... The Eratosthenian period in the lunar geologic timescale runs from 3,200 million years ago to 1,100 million years ago. ...

Enough subsistence has occurred to open a few arcuate grabens on the western margin of the mare. In geology, a graben is a depressed fault block bordered by normal faults. ...