The Gulf of Tunis is a large Mediterranean bay in north-eastern Tunisia, extending for 39 miles from Cape Farina in the west to Cape Bon in the east. Tunis, the capital city of Tunisia, lies at the south-western edge of the Gulf, as have a series of settled places over the last three millennia. Djebel Ressas rises to 795 metres around 15 kilometres south of the southeā¦The Gulf of Tunis is a large Mediterranean bay in north-eastern Tunisia, extending for 39 miles from Cape Farina in the west to Cape Bon in the east. Tunis, the capital city of Tunisia, lies at the south-western edge of the Gulf, as have a series of settled places over the last three millennia. Djebel Ressas rises to 795 metres around 15 kilometres south of the southern edge of the Gulf.