Cabeus is a lunar crater that is located about 100 km from the south pole. Hence, not much detail can be seen of this crater, even from orbit. Through a telescope, this crater appears near the southern limb , to the west of the crater Malapert and to the south-southwest of Newton. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On the Moon they are named after deceased scientists, polar explorers, astronauts or cosmonauts.