El Mar de la Serenidad seencuantra en la cuenca Serenitatis, que es del periodo Nectariano. El basalto cubre la mayor parte de la cuenca. Destaca en una de sus bordes el cráter Posidonius. En el borde del mar no se distingue ningún anillo a excepción de los Montes Haemus. Este mar es un ejemplo de mascon, lo que da lugar a anomalías gravitatorias.
Mare Frigoris, se encuentra al norte del Mare Imbrium. El cráter circular de la parte inferior de la imagen es Plato.
Mare Serenitatis is located within the Serenitatis basin, which is of the Nectarian epoch. The material surrounding the mare is of the Lower Imbrian epoch, while the mare material is of the Upper Imbrian epoch. The mare basalt covers a majority of the basin and overflows into Lacus Somniorum to the northeast. The most noticeable feature is the crater Posidonius on the northeast rim of the mare. The ring feature to the west of the mare is indistinct, except for Montes Haemus. Mare Serenitatis connects with Mare Tranquillitatis to the southeast and borders Mare Vaporum to the southwest. Mare Serenitatis is one example of a mascon, an anomalous gravitational region on the moon.
Mare Frigoris is a lunar mare located just north of Mare Imbrium, and stretches east to north of Mare Serenitatis. The mare is in the outer rings of the Procellarum basin. The basin material surrounding the mare is of the Lower Imbrian epoch, while the eastern mare material is of the Upper Imbrian epoch, and the western mare material is of the Eratosthenian epoch.
The dark circular feature just to the south of Frigoris is the crater Plato.
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