Wikipedia
Boussingault (crater)
Boussingault is a large lunar crater that lies near the rugged southeast limb of the Moon. Because of its location, Boussingault appears highly oblong in shape due to foreshortening. To the southwest is the crater Boguslawsky, and almost attached to the northeast rim is Helmholtz. East-southeast of Boussingault lies the crater Neumayer.
The most notable aspect of this crater is the large crater that lies entirely within its outer walls, so that it resembles a double-walled formation. The outer rim is worn and Boussingault K lies across the northwest rim. To the northwest is the overlapping triple crater formation of Boussingault E, B, and C.