Tags: Crater.
Posidonius is a lunar impact crater that is located on the north-eastern edge of Mare Serenitatis to the south of Lacus Somniorum. The crater Chacornac is attached to the southeast rim and to the north is Daniell.The rim of Posidonius is shallow and obscured especially on the western edge and the interior has been overlain by a lava flow in the past.
