Mare Serenitatis
Mare Serenitatis (the "sea of serentity") is a
lunar mare that sits just to the east of
Mare Imbrium. It is located within the Serenitatis basin, which is of the
Nectarian epoch. The material surrounding the mare is of the
Lower Imbrian epoch, while the mare material is of the
Upper Imbrian epoch. The mare
basalt covers a majority of the basin and overflows into Lacus Somniorum to the northeast. The most noticeable feature is the crater Posidonius on the northeast rim of the mare. The ring feature to the west of the mare is indistinct, except for
Montes Haemus. Mare Serenitatis connects with
Mare Tranquillitatis to the southeast.