Campanus & Mercator

Campanus & Mercator - Moon: South West Region
Rukl 53 VTM E12
This pair of 'twin' craters, Mercator (47 km) (LHS) & Campanus (48 km) (RHS), lie on the southern edge of Mare Nubium. Mercator has been flooded by lava, whereas Campanus contains a number of craterlets. The adjoining crater walls are separated by a valley