Montes Apenninus

[mon-tuh s ap-uh-nahy-nuh s]
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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018