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Mare Vaporum

American  
[vey-pawr-uhm, -pohr-] / veɪˈpɔr əm, -ˈpoʊr- /

noun

  1. (Sea of Vapors ) a dark plain in the first quadrant and near the center of the face of the moon: about 39,000 sq. mi. (101,000 sq. km).


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The counterscarp of the Apennines, in places 160 miles in width from east to west, runs down to the Mare Vaporum with a comparatively gentle inclination.

From The Moon A Full Description and Map of its Principal Physical Features by Elger, Thomas Gwyn

A portion of it is compared to the river Po, and he traces its course mile by mile up to the "delta" at its place of disemboguement into the Mare Vaporum.

From The Moon A Full Description and Map of its Principal Physical Features by Elger, Thomas Gwyn

Something more than a hundred miles east-southeast from Menelaus, in the midst of the dark Mare Vaporum, is another brilliant ring mountain which catches the eye, Manilius.

From Pleasures of the telescope An Illustrated Guide for Amateur Astronomers and a Popular Description of the Chief Wonders of the Heavens for General Readers by Serviss, Garrett Putman

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