Mare Cognitum - "Sea that has become known” Mare Cognitum is located in a basin or large crater which sits in the sencond ring of the Procellarum basin. The mare formations are of the Upper Imbrian epoch, while the surrounding basin material is of the Lower Imbrian epoch. You can clearly make out the mountain range Montes Riphaeus to the northwest of the mare. These mountains are a part of the rim crest of the buried crater or basin, containing the mare. Also, notice the lighter grey area to the upper right of the photo. This is Fra Mauro; the landing site of Apollo 14.   Source: Nasa
Mare Cognitum
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