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1. Mare Serenitatis: Mare Serenitatis /sɪˌrɛnɪˈteɪtɪs/ (Latin serēnitātis, the "Sea of Serenity") is a lunar mare located to the east of Mare Imbrium on the Moon. Its diameter is 674 km (419 mi). (Astronomy) [100%] 2023-12-08 [Maria on the Moon]