The largest city in Morocco, of which it is the second capital; is surrounded by walls and prettily situated in the valley of the Sebu, a stream which flows through its centre and falls into the Atlantic 100 m. to the E. It has been for many centuries one of the most important of the sacred cities of the Moslem; has many fine mosques, the Sultan's palace, and an important university; is yet a busy commercial centre, although signs of decay appear all over the city, and carries on an active caravan trade with Central Africa.