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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 kilometers.
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 20 and 200 km in diameter.