Lindenau is a lunar impact crater. It is located beside the east-southeastern rim of the crater Zagut, and to the northeast of Rabbi Levi. To the northeast is the slightly smaller crater Rothmann and the Rupes Altai scarp. It is 53 kilometers in diameter and 2.9 kilometers deep. (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.