Prandtl 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 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 across the southeastern outer rim of the huge walled plain Planck

Planck (crater)

Planck is a huge lunar crater that is located in the southern hemisphere of the Moon, on the far side as seen from the Earth. It lies to the west of the walled plain Poincaré, another enormous formation only slightly larger than Planck. Both formations are larger than the walled plain Bailly, the...

.

This crater is roughly circular, but with an outward bulge to the south-southeast. The rim is worn but still retains a well-defined edge. Several small craterlets lie along the rim and inner wall, the most notable being a pair of small craters along the eastern side and a small, eroded crater intruding slightly along the south. The interior floor is generally level, with only a small rise to the south of the mid-point. There is a cluster of three small craterlets along the southern inner wall.