Daubrée is a lunar crater that is located to the southwest of the Mare Serenitatis, just to the west-southwest of the crater Menelaus in the Montes Haemus range. The small lunar mare Lacus Hiemalis lies along the southwest rim. This is a horseshoe-shaped formation with the rim open to the northwest. The interior has been flooded by basaltic lava, leaving a level, featureless floor. (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.