Cave spring) is a town and commune, coextensive with the district of In Ghar, in In Salah Province, Algeria.

In Ghar lies at an elevation of 258 metres (846 ft) on a flat plain in the Sahara Desert of southern Algeria.

An oasis lies to the east of the town; it is extensively used for agriculture.

In Ghar has a hot desert climate (Köppen climate classification BWh), with long, extremely hot summers and short, very warm winters, little to no precipitation throughout the year, as well as permanent sunshine and clear skies.

In Ghar lies on the northern side of the N52 national highway which connects the town to Aoulef and Reggane to the west and In Salah to the east.