lunar features

Aspect of the Moon determined by past volcanic activity, meteorite impact and soil fractures.

cliff

Steep rock face shaped by a sea.

bay

Small plain of hardened lava located along the edges of a sea.

ocean

A very large sea.

crater

Circular basin dug out by the impact of a meteorite.

wall

Mountain usually surrounding a cirque.

mountain range

Vestiges of the walls of a once-large crater; semicircular in shape, it can span hundreds of miles.

sea

Designates the vast plains of hardened lava forming the dark regions; younger than the highlands, these cover 15% of the surface.

lake

Small isolated plain of hardened lava.

highland

Designates bright regions riddled with craters; these oldest regions cover 85% of the surface.

crater ray

Band that radiates from a young crater, the result of matter ejected during a meteorite impact.

cirque

Vast crater characterized by remarkable relief; varies between 12 and 120 mi in diameter.