Waikato River New Zealand

The Huka Falls are a set of waterfalls on the Waikato River that drains Lake Taupo in New Zealand.
A few hundred metres upstream from the Huka Falls, the Waikato River narrows from approximately 100 metres across into a canyon only 15 metres across. The canyon is carved into lake floor sediments laid down before Taupo's Oruanui eruption 26,500 years ago.
The volume of water flowing through can reach 220,000 litres per second - the roar was tremendous, the colour of the water spectacular!