Typhoons bolster world's largest tidal bore

The world’s largest tidal bore, on the Qiantang River in China, has been swollen by floodwaters caused by two typhoons.

Tourists gathered in Haining City in the eastern Zhejiang Province to watch swells of up to 15 metres high.

The phemonenon, which reaches its peak around this time of year, is caused by the pull of lunar gravity.