Salé is Rabat's older, more conservative sister across the Bou Regreg, and its medina is a different proposition from the capital's — smaller, tighter, almost exclusively local, and still with much of its pre-industrial character intact. The walled old city is anchored by the 12th-century Great Mosque and Merinid Medersa Abu al-Hassan at its centre, with working souks, several ziaras (saints' tombs), and the old kasbah walls reaching the Atlantic at Borj Adoumoue.