McMath is an impact 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 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...

's far side. It lies to the south-southwest of the prominent crater Jackson

Jackson (crater)

Jackson is a prominent lunar impact crater that is located in the northern hemisphere on the far side of the Moon. Less than one crater to the northeast is the crater Mineur, and to the south-southwest lies McMath....

, and material from the ray system

Ray system

A ray system comprises radial streaks of fine ejecta thrown out during the formation of an impact crater, looking a bit like many thin spokes coming from the hub of a wheel. The rays can extend for lengths up to several times the diameter of their originating crater, and are often accompanied by...

 centered on Jackson lies across most of McMath. Farther to the south lies the crater pair of Zhukovskiy

Zhukovskiy (crater)

Zhukovskiy is a lunar impact crater that lies on the far side of the Moon. It forms a pair with Lebedinskiy, which is attached to the eastern rim. There are no other named craters of note in the immediate vicinity, although the immense walled plain Korolev lies farther to the southeast.The rim of...

 and Lebedinskiy

Lebedinskiy (crater)

Lebedinskiy is an impact crater on the far side of the Moon. It is attached to the eastern outer rim of the somewhat larger crater Zhukovskiy. About two crater diameters to the east-southeast lies the smaller Engel'gardt...

.

This is a worn,torn up, and eroded crater formation with several small craters along the rim edge. The rim is the most heavily worn at the northern end, but is more intact to the east and west. The interior floor is relatively level, and is marked by only a few tiny craterlets.

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 McMath.

McMath	Latitude	Longitude	Diameter
A	19.2° N	165.3° W	15 km
J	14.8° N	163.3° W	36 km
M	16.1° N	165.5° W	15 km
P	13.4° N	168.6° W	28 km
Q	14.5° N	167.7° W	20 km