Reiner 7.0°N, 54.9°W

A crater, lying isolated in Oceanus Procellarum, 29 km in diameter. It is circular, but because of limb foreshortening appears significantly elliptical. The crater's floor is fairly rough and has – lying centrally – an elongated central mountain, orientated north-south.

Marius 11.9°N, 50.8°W

The crater Marius has a diameter of 41 km, a flat, smooth floor and a very low wall height above the crater's floor (1.6 km). Marius G (about 3.3 km) lies on the northern floor and the southeastern wall is breached by a small, slightly elliptical crater Marius H (5 km). Farther west of Marius lie the smaller craters Marius A and Kepler C (both about 10 km). They are linked by a ray of bright ejected material, part of Kepler's ray system.

The area south of Marius is rich in mare wrinkle ridges. North and west of the crater lies the largest group of related lunar domes. In total, Apollo images show over 300 of these volcanic structures, which are all only 200 to a maximum of 300 m high. The best observational conditions are about 12 to 13 days after New Moon, when the Sun illuminates the area at a grazing angle.

A complex, nameless system of mare wrinkle ridges begins south of Marius, and at 9.0°N, 51.8°W there lies a larger lunar dome with a summit crater.

Rima Suess 6.7°N, 48.2°W

A very narrow rille, whose observation requires a telescope with an aperture that is significantly larger than 250 mm. It lies south of Marius and begins near the craterlet Marius V (2 km, bright halo, near the impact site of Luna 7) and runs in a meandering fashion for a length of about 200 km in a southerly direction. It ends near the crater Suess D (c. 9 km). The crater Suess (12 km) is located about 50 km west of Suess D, and in between there is a section of mare wrinkle ridge.