Desargues is an ancient lunar impact crater that is located near the northern limb of the Moon, on the western hemisphere.

The proximity of this crater to the limb means that it appears highly elongated due to foreshortening, and it is difficult to discern details from the Earth.

This formation has been significantly eroded and degraded with the passage of time, leaving a low, irregular rim that has been reshaped by subsequent impacts.

The bulge to the northeast has left a remnant of its origin in the crater floor, as a series of low hills extending from the north and southeast.

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