The lower stream of Qiantang River is known as Fuchun River, 285 mi long in Zhejiang province. An important commercial artery, it flows NE to the East China Sea at Hangzhou.
The river and bay are known for the world's largest tidal bore, which is up to 9 metres high, and travels at up to 40 km per hour . The tide rushing into the river from the bay causes a bore usually from 5 to 15 ft high, which sweeps past Hangzhou and menaces shipping in the harbor. It is so dangerous that no one attempting to it has managed to remain upright for more than 11 seconds.
The First Qiantang River Bridge in Hangzhou was the first steel bridge to span across a major river in China when it was built in the 1930s.
The river is also the southern terminal of the ancient that links five major rivers in China from north to south, enabling traffic north to Beijing from Hangzhou via the Canal.
The Qiantang was previously known under the names Zhe River, Luocha River, or Zhi River. It was re-named "Qiantang" in honour of the kings of Wuyue , whose extensive hydro-engineering schemes in large part ensured the prosperity of the region in later centuries.