Centre Ville’s main east–west road is Ave Habib Bourguiba, running from Lake Tunis to Pl de l’Indépendance, with the medina at its western end and the upmarket suburbs near Parc du Belvédère to its north. A causeway at its eastern end carries road and rail traffic east across Lake Tunis to La Goulette, the location of Tunis' port, and then north along the coast to the suburbs of Carthage, Sidi Bou Saïd, La Marsa and Gammarth. The airport lies on the north side of the lake, as do the popular new suburbs of Berges du Lac and La Soukra.