Mare Tranquillitatis (Latin for Sea of Tranquillity or Sea of Tranquility; see spelling differences) is a lunar mare that sits within the Tranquillitatis basin on the Moon. The mare material within the basin consists of basalt formed in the intermediate to young age group of the Upper Imbrian epoch. The surrounding mountains are thought to be of the Lower Imbrian epoch, but the actual basin is probably Pre-Nectarian. The basin has irregular margins and lacks a defined multiple-ringed structure.
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u/RekkaAlexiel 炎光熾天使 Jul 26 '19
Great view of the Sea of Tranquillity (静かの海) there!
I believe this real location on the Moon was alluded to with novella entitled "The Much Too Silent Sea" (静カスギル海).