is an old lunar crater
on the Moon
's northern hemisphere
, and is located on the far side
relative to the Earth
. It lies just to the southeast of the slightly larger Perkin crater
. This is a worn and eroded formation, with features that have been softened and rounded over time. A cluster of small craters covers most of the northeastern rim. Several small craterlets lie along the edge to the south and west. The bowl-like interior is nearly featureless, with only a few small craterlets to mark the surface.
By convention these features are identified on lunar maps by placing the letter on the side of the crater mid-point that is closest to Guillaume crater.