Geological Chronicle
South is a large lunar impact crater spanning 119.04 kilometers in the northwest part of the Moon. Most of its southern wall joins Sinus Roris, a bay of Oceanus Procellarum, with the southeast rim facing Mare Frigoris. Attached to the northwest is the larger walled plain Babbage, while Robinson and another walled plain, J. Herschel, lie to the northeast.
Little remains of the original rim, which now forms a disintegrated ring of low ridges. The most prominent surviving section lies along the northwest, while the southern half of the rim barely exists as low rises in the surface.
The interior floor has been resurfaced by basaltic lava and is relatively level with no prominent features. Many tiny craterlets mark the floor, especially across the southern half and along the remnant of the southern and southwestern rim.