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Mare Serenitatis

[suh-ren-i-tah-tis] /səˌrɛn ɪˈtɑ tɪs/
noun
1.
(Sea of Serenity) a dark plain in the first quadrant of the face of the moon: about 120,000 sq. mi. (310,000 sq. km).
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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