Kovalevskaya is a prominent lunar impact crater on the far side. It lies to the southwest of the larger walled plain Landau. To the south are the craters Poynting and Fersman. This crater overlies nearly half of the large Kovalevskaya Q along the southwest rim. (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.