The place with the waterfall in the middle of the desert. It only takes half an hour drive straight through the desert till you get on the Algerian border. The mountains witch lay aside the village do not look exciting, but when you pass the waterfall, and climb up to the top and follow the paveway to get up there, the big surprise is there for you: not only a magnificant panoramic view from the desert, but the materials the mountains exist of: fossile sea bottom.
In Chebika you are about 400 miles deep in the desert, and still you find the fossile remains of the sea that once was in that part of what we nowadys call Tunesia. See picture.
An unforgettable place to be.