Langrenus (crater) (Wikipedia) Langrenus is an impact crater located near the eastern lunar limb. The feature is circular in shape, but appears oblong due to foreshortening. It lies on the eastern shore of the Mare Fecunditatis. To the south is the overlapping crater pair Vendelinus and the smaller Lamé. Mare Crisium and Langrenus under the blue sky The interior of the crater has a higher albedo than the surroundings, so the crater appears bright when the Sun is overhead.