Situated at the far end of the gulf of Boughrara, facing the island of Jerba, Gigthis was in turn, a Phoenician emporium, the headquaters of the Cinithians - a Berber tribe or confederation of tribes whose territory spread over the plain of Jaffara - and a Roman free town since the reign of the emperor Antoninus Pius. A thriving city, thanks to its trading vocation, and served by an excellent geographical position, Gigthis had monumental attractiveness worthy of the largest Roman cities. Today one can still enjoy the following vestiges : a forum, temples - one of which dedicated to the Alexandrian divinity Serapis, and another one to Mercury, the god of commerce - thermes, villas, a market (marcellum), etc. Dating back to the later period, especially the Byzantine one, the site shows in the north the ruins of a citadel having 60 m per side. Near the sea, however, the vestiges of the port infrastructue tend to be immersed.