Altogether, the Portuguese are documented to have seized 6 Moroccan towns, and built 6 stand-alone fortresses on the Moroccan Atlantic coast, between the river Loukos in the north and the river of Sous in the south. Four of them only had a short duration: Graciosa (1489), São João da Mamora (1515), Castelo Real of Mogador (1506–10) and Aguz (1520–25). Two of them were to become permanent urban settlements: Santa Cruz do Cabo de Gué (Agadir, founded in 1505-06), and Mazagan founded in 1514-17.