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Why is the Luzon Strait important to the South China Sea?

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Physical map of the East China Sea, South China Sea, and Yellow Sea, showing surrounding countries, major cities, and maritime boundaries. The map highlights sea depths with color shading, features such as the Macclesfield Bank and Philippine Trench, and includes a locator inset for regional context.
South China Sea

The Luzon Strait is vital to the South China Sea primarily because it serves as the main deep-water channel connecting the sea to the Pacific Ocean.12

Its importance is defined by several key factors:

  • Navigation: It is a critical shipping route for international maritime traffic.1
  • Hydrology: The strait facilitates the exchange of water between the South China Sea and the Pacific Ocean, playing a role in the region's circulation patterns.2
  • Physical Geography: Located between Taiwan and the Philippines, it provides a significant deep-water passage—reaching depths of about 8,500 feet (2,600 meters)—that contrasts with the shallower channels found elsewhere in the region.2