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Why are tidal ranges especially high along China’s East China Sea coast?

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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

Tidal ranges along China’s East China Sea coast are especially high due to the constricting nature of the adjoining Yellow Sea and the funnel shape of various inlets along the mainland coast. These physical characteristics amplify the movement of water, resulting in significant tidal variations, such as spring tide ranges reaching up to 23 feet (7 metres) at Sansha Bay and 30 feet (9 metres) at Hangzhou Bay.1