Lambert is a lunar impact crater on the southern half of the Mare Imbrium basin.

The crater is relatively easy to locate due to its isolated position on the mare.

It has an outer rampart, terraced inner walls, and a rough interior that has a comparable albedo to its surroundings.

The diameter of this ghost crater is larger than Lambert, but it is difficult to spot except when the Sun is at a very low angle, casting long shadows.

[2] By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Lambert.