Jisho

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Expression, Noun
1. lunar mare; lunar sea
Wikipedia definition
2. Lunar mareThe lunar maria  /ˈmɑriə/ are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions. They were dubbed maria, Latin for "seas", by early astronomers who mistook them for actual seas. They are less reflective than the "highlands" as a result of their iron-rich compositions, and hence appear dark to the naked eye. The maria cover about 16 percent of the lunar surface, mostly on the near-side visible from Earth.
Read “Lunar mare” on English Wikipedia
Read “月の海” on Japanese Wikipedia
Read “Lunar mare” on DBpedia

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