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Fuchun (fōō´chŏŏn´) or Qiantang (chēĕn´täng´), river, 285 mi (459 km) long, Zhejiang prov., SE China. An important commercial artery, it flows NE to the East China Sea at Hangzhou. The tide rushing into the river from the bay causes a bore from 5 to 15 ft (1.5–4.6 m) high, which sweeps past Hangzhou and menaces shipping in the harbor. The names sometimes appear as Fu-ch'un and Tsientang or Ch'ien-tang.