The Bataan Peninsula is in western Luzon, Philippines, sheltering Manila Bay (to the east) from the South China Sea. It is about 30 miles (50 km) long and 15 miles (25 km) wide. Corregidor Island lies just off its southern tip at the entrance of the bay. Bataan is largely covered by jungle and is traversed north to south by steep mountains culminating in Mount Natib (4,224 feet [1,287 metres]) in the north and Mount Bataan (4,701 feet [1,433 metres]) in the south.

The major city on the peninsula is Balanga. Subic Bay in the north is the site of U.S. (1901–92) and Philippine naval bases. Because of the proximity of Manila, none of Bataan’s five ports is open to overseas shipping. The towns of Orani, Samal, Abucay, Orion, and Limay are located along the eastern coastal plain, the principal agricultural (rice, corn [maize], sugarcane) district. Morong and Bagac are on the western coast. Hermosa in the north is the site of Roosevelt National Park (1933), a 3,296-acre area with hot springs and a game refuge. Bataan National Park (1945), on Manila Bay, is largely a World War II commemorative area of 77,593 acres. The area is 530 square miles (1,370 square km).

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