Dellys is a small Mediterranean town in northern Algeria's coastal Boumerdès Province, almost due north of Tizi-Ouzou and just east of the Sebaou River. It is the district seat of the daïra of Dellys. The town is 45 km from Tizi Ouzou, 50 km from Boumerdes, and about 100 km from the capital Algiers.