the East China Sea and the South China Sea, taken together.
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British Dictionary definitions for china sea
part of the Pacific Ocean off the coast of China: divided by Taiwan into the East China Sea in the north and the South China Sea in the south
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012