Cook is a lunar

Moon

The Moon is Earth's only known natural satellite,There are a number of near-Earth asteroids including 3753 Cruithne that are co-orbital with Earth: their orbits bring them close to Earth for periods of time but then alter in the long term . These are quasi-satellites and not true moons. For more...

 crater

Impact crater

In the broadest sense, the term impact crater can be applied to any depression, natural or manmade, resulting from the high velocity impact of a projectile with a larger body...

 that lies in the western part of the Mare Fecunditatis

Mare Fecunditatis

Mare Fecunditatis is a lunar mare which is 840 km in diameter. The Fecuditatis basin formed in the Pre-Nectarian epoch, while the basin material surrounding the mare is of the...

, just to the southeast of the prominent crater Colombo

Colombo (crater)

Colombo is a lunar impact crater that lies on the strip of rough continental terrain between Mare Fecunditatis to the east and Mare Nectaris in the west. It is located to the south of the crater Goclenius, and northwest of Cook....

. To the southwest is Monge

Monge (crater)

Monge is a lunar crater that lies along the southwestern edge of the Mare Fecunditatis. The outer rim is somewhat irregular in shape, with an outward bulge to the east and smaller bulges to the north and northwest. The interior floor is somewhat irregular in the eastern half, and there are...

.

The interior of this crater has been flooded with lava

Lava

Lava refers both to molten rock expelled by a volcano during an eruption and the resulting rock after solidification and cooling. This molten rock is formed in the interior of some planets, including Earth, and some of their satellites. When first erupted from a volcanic vent, lava is a liquid at...

, leaving only a low rim projecting above the surface. This rim is not quite circular, and has a somewhat hexagonal appearance. The low wall is worn in a few places, particularly along the northeastern rim. There is a tiny craterlet called Cook A on the interior floor near the southeast rim.

Satellite craters

By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Cook.

Cook	Latitude	Longitude	Diameter
A	17.8° S	49.2° E	6 km
B	17.3° S	51.7° E	9 km
C	18.2° S	51.3° E	5 km
D	20.1° S	53.4° E	4 km
E	18.4° S	55.1° E	5 km
F	17.6° S	55.4° E	7 km
G	18.9° S	48.7° E	9 km