The heavily cratered terrain has numerous craters greater than in diameter. It is densely cratered and heavily eroded. Although Mimas is heavily cratered, the cratering is not uniform. The northern rise partially overlies sparsely cratered, lowland plains north of the dichotomy boundary. Heavily cratered surfaces are old, and sparsely cratered surfaces are young. The plains have a relatively sharp boundary with the surrounding cratered terrain. The V-shaped cusps are adjacent to older, more heavily cratered terrains. The leading hemisphere is heavily cratered and uniformly bright. The far side has a battered, densely cratered appearance with few maria. It is cold, icy, and heavily cratered, with a very tenuous atmosphere. Tethys is heavily cratered and cut by a number of large faults/graben. Many of these fractures are found in bands cutting across cratered terrain. From the Earth, it is viewed edge-on in a region of rough, cratered terrain. Some of the plains are more heavily cratered than others. The highlands are older than the visible maria, and hence are more heavily cratered.