Runge is a lunar crater in the Mare Smythii, along the eastern edge. It lies less than one crater diameter to the north-northwest of the very similar crater Warner. To the west-northwest is Haldane. Runge has been almost completely submerged by basaltic lava, leaving only a low, ring-shaped feature in the lunar mare. (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.
