Geological Chronicle
Erlanger is a very deep lunar impact crater that lies near the north pole of the Moon. The formation spans an official diameter of 10.94 kilometers.
Due to its position near the lunar north pole (and given that the Moon's axis is only tilted about 1.5°), sunlight only rarely falls on the bottom, and the 2008 Chandrayaan-1 probe hoped to find that ice from comet impacts had accumulated there. It is recorded in the IAU Gazetteer under quadrangle LAC-1.