thumb|right|Oblique view facing south of Mare Vaporum from lunar orbit ([[Apollo 17)]]
thumb|Western Mare Vaporum during sunrise, from [[Apollo 15]]
Mare Vaporum (Latin vapōrum, the "sea of vapors") is a lunar mare located between the southwest rim of Mare Serenitatis and the southeast rim of Mare Imbrium. It was named by Giovanni Battista Riccioli in 1651.
Location and size
The mare lies in an old basin or crater that is within the Procellarum basin.