Apianus est un cratère de 63 Km et profond de 2080 m situé sur une région continentale riche en cratères. Son fond est plat parsemé de petits cratères. Ses murailles sont impactés à l’est et au nord par des cratères. A l’ouest le cratère Krusenstern (47 Km), mal dessiné, est mitoyen.

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Apianus is a lunar impact crater that is located on the rugged south-central highlands of the Moon. It is located to the northeast of Aliacensis crater, and to the northwest of the Poisson crater remnant. The worn crater Krusenstern is attached to the west-northwestern rim.

The outer wall of Apianus crater has been worn and eroded by subsequent impacts, and a pair of small craterlets overlay the rim to the southeast and northeast. The craterlet on the southeast rim, 'Apianus B', is a member of a cluster of co-joined craterlets that includes 'Apianus T' and 'Apianus U'. The interior floor is relatively smooth and lacks a central peak, although the surface appears somewhat convex. Only a few tiny craterlets mark the surface.