Dawson is a lunar impact crater that lies on the southern hemisphere on the far side. It lies across a crater triplet: the southeast rim is intruding into the crater Alekhin; the northwest rim also intrudes into the larger satellite crater Dawson V, and the northeast rim is attached to the comparably sized Dawson D. To the south of this formation is the large crater Zeeman. West is the crater Crommelin, and to the north lies Fizeau. Dawson is a young formation that lies in the midst of a field of ancient, heavily eroded craters. (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.