[1] Derrag is located on the southern side of the Tellian Atlas, west of the Oursenis.

It is located within the Bled Derrag area in the corner between the forests of Chaoun and Boumedienne, separated from the high plateau by the Taguensa and Djebel Azzeba.

Located in the Ouarsenis mountain region, much of the land is sloped and hence unfavourable to mechanised farming and susceptible to erosion.

The region of Bled Derrag was attached to the mixed commune of Theniet El Had at the beginning of colonisation.

This area then passed under the authority of the mixed-commune of Boghari until 1956, when it became a fully functioning commune separated from Siouf.