Montes Harbinger is an isolated cluster of lunar mountains at the western edge of the Mare Imbrium basin.

[1] The mountains consist of four primary ridges plus several smaller hills, each forming a small rise surrounded by the lunar mare.

The cluster is centered at selenographic coordinates 26.9° N, 41.3° W, within a diameter of 93 km.

[2] The formation is so-named because the peaks serve as the harbingers of dawn on the crater Aristarchus,[1] located to the southwest.

The flooded crater Prinz is located to the southwest.