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A photo taken by Chinese National Geography shows tides in the shape of fish scales in Haining, Jiaxing, Zhejiang province. [Photo/WeChat account: cnjxrb]

The Qiantang River entered its tidal bore period in the seventh lunar month, and spectacular tidal waves have recently appeared, local media reported on Aug 10.

There are more than 700 tides in the Qiantang River every year, most of which are medium-sized or small. Big tides come at the beginning and end of each lunar month.

The "tide watching festival" in Haining, a county-level city in Jiaxing, East China's Zhejiang province, is on the 18th day of the eighth lunar month.

The Qiantang River, the Amazon River in South America and the Ganges River in South Asia are known as the "the world's three strong tide rivers".

The effect of the moon, the sun and other celestial bodies on the sea water causes the tide. The horn shape of Hangzhou Bay and the huge sandbar at the mouth of the bay make the tides of the Qiantang River especially spectacular.