Manila Bay, the South China Sea Bay, is almost completely land-locked, located in the southwest of Luzon Island. It is one of the world's largest harbors with an area of 2,000 square kilometers (770 square miles). The widest point is 58 kilometers (36 miles). Corregidor Island, 48 kilometers (30 miles) west of Manila, divides the 18 kilometers (11 miles) wide bay entrance into two straits: the South and the north, which are safer to navigate and 3 kilometers (2 miles) wide. The northern and northeastern shores of the Gulf are connected with the central plain of Luzon, and the coastal waters are shallow. They are the largest commercial fishing grounds in the Philippines. Port Manila is located in the easternmost part of Manila Bay, including the north port for inter-island navigation and the south port for international navigation. The Bataan Peninsula and the mountains of Central Cordillera form a natural barrier, making Manila Bay an excellent anchorage. Near Southeast Asia, the Bay was commercially important as early as the Spanish colonial period in 1571. On May 1, 1898, the U.S. Army destroyed the Spanish fleet in the decisive naval battle of the American-Spanish War (the Battle of Manila Bay).