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Britannica Sources used in this answer

How old is the Okinawa Trough thought to be?

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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.
East China Sea

The Okinawa Trough is estimated to be approximately 10 million years old. It is a young marginal basin created by the extensional tectonics of arc massifs, a process that has caused some island arcs to split apart in recent geologic time.12