The south of the governorate tapers in a curve to include the three main peaks at the head of the valley in the dorsal[clarification needed] Atlas Mountains.

Shortly after leaving the governorate, the Oued Siliana feeds into the valley of the Medjerda River, which flows east.

Two forested ridges form national parks mainly within and outside the north-west and south-east borders respectively.

], is an artificial reservoir and is the largest lake in the province, followed by the Lakhmess Barrage in the south-east, which is less than a third of its size.

The climate is more Mediterranean than desert, as it is near the coast (see Tunisia§Climate) with temperatures in all but the northern borders moderated by its high elevation.