Maputo, formerly Lourenço Marques, is the capital an largest city of Mozambique. A port on the Indian Ocean, its economy is centered around the harbour. It has an official population of approximately 966,837 (1997), but the actual population is estimated to be much higher because of slums and other unofficial settlements. Coal, cotton, sugar, chromite, sisal, copra, and hardwood are the chief exports. The city manufactures cement, pottery, furniture, shoes, and rubber. There is also a large aluminium smelting plant, Mozal. The city is surrounded by Maputo Province, but is administered as its own province.