From Wikipedia: The bay is considered to be one of the best natural harbors in Southeast Asia and one of the finest in the world. It has an area of 1,994 km2 (769.9 sq mi), and a coastline of 190 km (118.1 mi). The entrance is 19 km (11.8 mi) wide and expands to a width of 48 km (29.8 mi). Corregidor Island divides the entrance into two channels, about 2 miles (3.2 km) towards the North and 6.5 miles (10.5 km) wide on the South side. Mariveles, in the province of Bataan, is an anchorage just inside the northern entrance and Sangley Point is the former location of Cavite Naval Base.