Part of the western Pacific Ocean between Java and Borneo islands.
Measuring 900 mi (1,450 km) long by 260 mi (420 km) wide, it occupies a total area of 167,000 sq mi (433,000 sq km). A shallow sea, it has a mean depth of 151 ft (46 m). It was the scene of a World War II naval battle (1942) that resulted in an Allied defeat and Japan's invasion of Java.