Sinus Medii 0.0°, 0.0°

Sinus Medii (‘Central Bay’), is a moderately large lava area about 350 km across. It lies nearly in the centre of the nearside of the Moon and thus contains the origin of the system of lunar coordinates. There are many interesting surface features in this area – which are even visible in small telescopes.

Herschel 5.7°S, 2.1°W

Herschel is a prominent crater, 40 km in diameter, with a rough crater floor, eccentric small central peak, and terraced inner crater walls. It lies directly north of the large complex crater Ptolomaeus.

Gyldén 5.3°S, 0.3°W

An almost completely destroyed crater, 47 km in diameter. The western wall is breached by a wide valley, caused by secondary impacts and shock waves from the Imbrium impact.

Bruce 1.1°N, 0.4°E

A circular crater, 6 km in diameter, lying closest to the origin of the lunar coordinate system.

Réaumur 2.4°S, 0.7°E

An almost completely destroyed crater, 52 km in diameter, with partially submerged crater walls in the north. Rima Réaumur (about 30 km) lies to the east and Rima Oppolzer (about 95 km) to the north of the crater remnant. Both rilles are surface fractures, that is, linear rilles. Adjoining them on the west is the 80-km long Rimae Flammarion system.

Oppolzer 1.5°S, 0.5°W

A crater remnant, lying northwest of Réaumur, and separated from it by Rima Oppolzer. Only rudimentary portions of Oppolzer's northern crater wall still exist.