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Montes Apenninus

[mon-tuh s ap-uh-nahy-nuh s]
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noun
  1. a mountain range in the first and second quadrants of the visible face of the moon, forming the SE border of Mare Imbrium: about 600 miles (970 km) long.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018