Port of Spain, surrounded by lush green hills, is the capital and business hub of oil-rich Trinidad. Bazaars throng beneath modern skyscrapers and mosques rub shoulders with cathedrals. San Fernando is the island's second town and the main commercial centre in the south. Close by is the fascinating natural phenomenon of the Pitch Lake, a 90-acre (36.4 hectares) lake of asphalt which constantly replenishes itself.