Koch is a 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...

 on the far side of the Moon

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...

. It lies in the southern hemisphere, to the south-southeast of the walled plain Jules Verne

Jules Verne (crater)

Jules Verne is a large lunar crater on the far side of the Moon, named after the French author. It is located to the west-southwest of the Mare Ingenii, one of the few lunar mares on the far side. To the southeast of Jules Verne is the crater Lundmark, while Koch is located to the south-southeast...

. Attached to the northeastern rim of Koch by a neck of uneven terrain is the crater Lundmark

Lundmark (crater)

Lundmark is an eroded crater on the far side of the Moon. It lies to the southwest of the Mare Ingenii, one of the rare mare areas on the far side...

. Less than one crater diameter to the south of Koch is Crocco

Crocco (crater)

Crocco is a lunar crater that is located on the far side of the Moon from the Earth. It is located to the northeast of the huge walled plain Planck, and northwest of the equally huge Poincaré. Just to the north, within one crater diameter, is the crater Koch....

.

This crater has a worn and eroded outer rim. Several small craters lie along the outer rim, particularly along the northern edge. Attached to the western side is the satellite crater Koch U. The interior floor is also marked by some small craters, with a pair located just to the north of the mid-point and another along the southern inner wall.

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 Koch.

Koch	Latitude	Longitude	Diameter
R	44.5° S	146.3° E	20 km
U	42.3° S	147.4° E	25 km