Mare Nubium 20.0°S, 15.0°W

Mare Nubium (‘Sea of Clouds’) is irregular, roughly round in shape, with no distinct boundaries anywhere, such as those found with other maria, typically in the form of sections of wall. It is possibly part of the enormous lava flow to which Mare Cognitum, Mare Insularum and parts of Oceanus Procellarum belong. It has a diameter of roughly 750 km and the lava covers an area of about 250 000 km2. Mare Nubium offers a multitude of interesting surface features for both visual and photographic observation.

Lubiniezky 17.8°S, 23.8°W

An almost completely lava-filled crater, 44 km in diameter, similar to Keis, lying northwest of Bullialdus. The southeastern crater wall is open to the lava surface of Mare Nubium. The maximum difference in height between the crater's wall and the floor amounts to just 770 m. Northwest of Lubiniezky lie the two craters Lubiniezky A and E. The former crater wall of Lubiniezky E (c. 40 km, 16.5°S, 27.2°W) has been practically completely submerged by lava, only a few individual peaks stick up above the surface of the lava.

Bullialdus 20.7°S, 22.2°W

A very conspicuous crater, 60 km in diameter, with terraced inner crater walls and a central mountain with multiple peaks. Melted ejecta material lies radially around the outside of the crater. It appears like a smaller version of the large crater Copernicus, but under high solar illumination shows no sign of a ray system, despite the fact that it must be relatively young.