Mare CognitumMare Cognitum
(the "sea that has become known") is a lunar mare
located in a basin or large crater
which sits in the second ring of the Procellarum basin
. The basin material is of the Lower Imbrian epoch
, while the basaltic mare material is of the Upper Imbrian
epoch. To the northwest of the mare is the Montes Riphaeus
mountain range, part of the rim of the buried crater or basin containing the mare.
Fra Mauro, the landing site of Apollo 14, is located near Mare Cognitum.