Mare Frigoris

Mare Frigoris (the "sea of cold") is 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.