South China Sea (16,456 ft) (5,016 meters)

The South China Sea is a marginal sea that is part of the Pacific Ocean, encompassing an area from the Karimata and Malacca straits to the Strait of Taiwan of around 3,500,000 square kilometres (1,400,000 sq mi). The sea carries tremendous strategic importance; one-third of the world's shipping passes through it, carrying over $3 trillion in trade each year, it contains lucrative fisheries, which are crucial for the food security of millions in Southeast Asia. Huge oil and gas reserves are believed to lie beneath its seabed.

South China Sea is the dominant term used in English for the sea, and the name in most European languages is equivalent. This name is a result of early European interest in the sea as a route from Europe and South Asia to the trading opportunities of China. In the sixteenth century Portuguese sailors called it the China Sea (Mare da China); later needs to differentiate it from nearby bodies of water led to calling it the South China Sea.

The sea’s major feature is a deep rhombus-shaped basin in the eastern part, with reef-studded shoals rising up steeply within the basin to the south (Reed and Tizard banks and the Nanshan Island area) and northwest (Paracel Islands and Macclesfield banks). The deep portion, called the China Sea Basin, has a maximum depth of 16,457 feet (5,016 metres) and an abyssal plain with a mean depth of some 14,100 feet (4,300 metres).