Best viewed in the days leading up to first quarter, Mare Serenitatis is a giant, lava-filled impact basin situated between Mare Tranquilitatis and Mare Imbrium. The mare is bordered on the south by the Haemus Mountains and on the west by the Caucasus Mountains. Just south of the Haemus Mountains, in Mare Tranquilitatis is the crater Plinus, while on the eastern edge of Mare Serenitatis is the large crater Posidonius.
The 2 large craters to the north of Mare Serenitatis are Eudoxus and Aristoteles.
On the southern rim of the Mare is the crater Menelaus, with a ray stetching across the Mare, while further to the west is the crater Manilius. This crater sits on the eastern edge of Mare Vaporum. The large shallow crater on the eastern (left) shore of the maria is Posidonius.
Moving slightly north and east brings the crater Archimedes with its companions Aristillus and Autolychus.