King is a prominent lunar impact crater on the far side , and can not be viewed directly from Earth. It forms a pair with Ibn Firnas, which is only slightly larger and is attached to the northeast rim. To the northwest is the crater Lobachevskiy, and Guyot is located an equal distance to the north-northwest. The outer rim is roughly circular but with a slightly irregular appearance, particularly at the northern end. (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.