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Wikipedia definition
1. Mare SerenitatisMare Serenitatis (the "Sea of Serenity") is a lunar mare that sits just to the east of Mare Imbrium on the Moon. 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.
Read “Mare Serenitatis” on English Wikipedia
Read “晴れの海” on Japanese Wikipedia
Read “Mare Serenitatis” on DBpedia

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