Borj Sud, also Burj al-Janub, is a historic fort located in Fes, Morocco. It was built in 1582 AD by the Saadi Sultan Ahmad al-Mansur. The fort, which was designed in the style of Portuguese forts, is located in an elevated area overlooking the old city of Fes. Borj Sud was inscribed as a UNESCO World Heritage Site in 1981 as part of Medina of Fez.