Sanford is a lunar impact crater that is located in the northern latitudes. It lies to the south-southeast of the crater Klute, and just to the west-northwest of Teisserenc. To the southwest lies Joule. This is a circular crater formation with a worn outer 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.