Chebika lies at the foot of the mountains of the Djebel el Negueb and, because of its exposure to the sun, it is known as Qasr el-Shams ("Castle of the Sun" in Arabic). In antiquity, it was once a Roman outpost, named Ad Speculum and later a mountain refuge of the Berber people. Ad Speculum was civitas of [1] the Roman Province of Africa between 30 BC and 640 AD.[2] Located on the Saharan limes [it] just north of Ad Turres. It was a station on the road linking Tebessa to Gafsa, the Romans used mirrors to communicate with other posts and report possible enemy incursions. The contemporary village of Chebika ( الشبيكة ) has several hundred residents, built near the old town, abandoned in 1969 after catastrophic flooding. The site, writes Jean Duvignaud, "is placed in the intersection of two advances of the mountain that opens here towards the desert".[3] The urban fabric consists of a chessboard whose lines are formed by streets intersecting at the level of the market place. Many scenes of the movie Star Wars Episode IV: A New Hope and The English Patient were shot in this area.