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.