Buch is an old, worn crater that is located in the rugged southern highlands of the Moon.

The crater rim is slightly elongated in the northeastern direction, and forms an egg-shaped depression in the surface.

The rim has been eroded by many lesser impacts so that the edge is rounded and worn down, and the crater forms only a low depression in the ground.

Early speculation was that this may be volcanic in nature, but it was later demonstrated to be a typical impact crater that was formed over a pocket of darker material.

[1] By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Buch.