The Bohai Sea lies in northern China, surrounded by Liaoning, Hebei, Tianjin, and Shandong.
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China's only fully-enclosed sea, technically a gulf of the Yellow Sea. Average depth just 18m. Surrounded by the 环渤海经济圈 (Bohai Economic Rim), one of China's three major coastal economic zones alongside the Yangtze and Pearl River deltas.