Songo Mnara, offshore from Kilwa Masoko and about 8km south of Kilwa Kisiwani, contains ruins at its northern end that are believed to date from the 14th and 15th centuries. They are considered in some respects to be more significant architecturally than those at Kilwa Kisiwani, with one of the most complete town layouts along the coast. Together with Kilwa Kisiwani, they have been declared a Unesco World Heritage Site.
