It seems you confused the second largest city of Tunisia, Sfax (which has a metropolitan area population of over 1 million), with the third largest city Sousse (which has metropolitan area population of less than 1 million) though.
It seems you confused the second largest city of Tunisia, Sfax (which has a metropolitan area population of over 1 million), with the third largest city Sousse (which has metropolitan area population of less than 1 million) though.