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Mare Boreum

[ bawr-ee-uhm, bohr- ]
/ ˈbɔr i əm, ˈboʊr- /
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noun
(Northern Sea) an area near the north pole of Mars, appearing as a dark region when viewed telescopically from the earth.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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