Zanstra 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 is located 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 to the southeast of the crater pair Ibn Firnas

Ibn Firnas (crater)

Ibn Firnas is a lunar impact crater on the far side of the Moon, in honour of Abbas Ibn Firnas , who is regarded as the first man to have attempted flying with evidence of some success. Attached to the exterior of its southwestern rim is the prominent crater King...

 and King

King (crater)

King is a prominent lunar impact crater that is located on the far side of the Moon, and can not be viewed directly from Earth. It forms a pair with Ibn Firnas, which is only slightly larger and is attached to the northeast rim of King...

, and northwest of Gregory

Gregory (crater)

Gregory may refer to:* Gregory * Gregory on the planet Venus...

. This is a low, eroded formation that is difficult to distinguish from its surroundings. The interior floor is level and not significantly impacted.

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 Zanstra.

Zanstra	Latitude	Longitude	Diameter
A	4.5° N	125.2° E	36 km
K	2.0° N	125.2° E	14 km
M	1.1° N	125.0° E	23 km