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(Mon, 01 Jul 2024) The East China Sea is a semi-closed sea bordered by the Yellow Sea to the north, the South China Sea and Taiwan to the south, Japan's Ryukyu and Kyushu islands to the east, and the Chinese mainland to the west. It has a total area of approximately 290,000 square miles, consisting of mostly shallow waters; three-fourths of the sea is less than 500 feet deep. In the Okinawa Trough, the depths exceed 6,500 feet.