Geological Chronicle
Nicolai is a lunar impact crater that is located in the southern hemisphere of the Moon, in a region that is less disturbed by significant impacts than most of the highlands. The formation spans an official diameter of 40.54 kilometers.
The nearest craters of note are Spallanzani to the south, and the much larger Maurolycus and Barocius to the east. It is recorded in the IAU Gazetteer under quadrangle LAC-113.