East China Sea

The eastern East China Sea lies beyond Kyushu, the Ryukyu island arc and Taiwan, where the broad shelf opens through island straits into the Pacific. Mainland rivers bring sediment onto shallow banks, while the Okinawa Trough and deep channels lie to the east. The Tokara and Miyako straits, together with passes around the Ryukyus, provided navigable openings, but currents, reefs and seasonal storms made each passage a distinct route.

Chinese coastal ships crossed the sea for rice, silk, ceramics, salt and timber. Ryukyuan seafarers formed an important intermediary kingdom whose ports linked the mainland with Japan, carrying diplomatic missions, horses, sulphur and tropical goods between China, Japan and the island archipelago. Fishermen used the shallow fishing grounds around the Yangtze and island shelves, and island communities supplied pilots, water and shelter. Navigation followed coasts, reefs and monsoonal winds rather than a single open track.

During the sixteenth and seventeenth centuries, Japanese and European maritime competition increased, while Ryukyu’s trade declined under Japanese control. Chinese junk fleets, Japanese coastal shipping and pirates shared the sea, with local knowledge determining which straits remained safe. Piracy and private trade increased whenever central fleets weakened, making island havens and quiet channels part of the same economy. The eastern waters therefore connected China’s river mouth to a chain of island societies and Pacific passages, binding trade, fishing and strategic control together.