Cleomedes 27.7°N, 56.0°E

Cleomedes is a very conspicuous crater with a diameter of 126 km. There are small craters and a central peak visible on the floor. Across the northern portion runs Rima Cleomedes, a 30 km-long rille that is difficult to observe. (A large telescope, the correct lighting and a favourable libration are required.) The northern wall of the crater has eroded and has been breached by the craters Trailes (43 km, 28.4°N, 52.8°E), Cleomedes A (14 km) and Cleomedes E (20 km).

Geminus 34.5°N, 56.7°E

Messala 39.2°N, 60.5°E

Burckhardt 31.1°N, 56.5°E

North of Cleomedes lies Burckhardt, a 56 km-diameter crater. Burckhardt is superimposed on two smaller craters, Burckhardt E (39 km) and Burckhardt F (43 km). Normally, large craters are superimposed by smaller ones, but with Burckhardt the direct opposite is the case.

Even farther north lie the two craters Geminus and Messala. Geminus with a diameter of 85 km is another striking crater in this area of the Moon. The crater has a central peak and the southern wall is breached by a wide valley. Because of its size of 125 km, Messala would once have been classed as a ‘walled plain’. The floor is relatively smooth, but the view in large telescopes reveal some irregularities. Geminus C (16 km) and Messala G (29 km) are smaller craters that lie close to conspicuous rays of impact material, which are visible under high angles of illumination. The origin of the ray system cannot, however, be determined.