Mare Vaporum (the "sea of vapors") is a lunar mare located between the southwest rim of Mare Serenitatis and the southeast rim of Mare Imbrium. The lunar material surrounding the mare is from the Lower Imbrium[?]epoch, and the mare material is from the Eartosthenian[?] epoch. The mare lies in an old basin or crater that is within the Procellarum basin. To the south of the mare is a light colored thin line. This feature is Rima Hyginus[?]. The mare is bordered by the mountain range Montes Apenninus.
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