Dettifoss is the most powerful waterfall in Europe, with a water flow of 6,186 cfs (193 cms). The waterfall is created by the Jökulsá á Fjöllum river, where it spreads out 328 ft (100 m) and plummets 148 ft (45 m) into the Jökulsárgljúfur canyon. You can find two more impressive waterfalls within the canyon, Selfoss and Hafragilsfoss.

Selfoss is 36ft (11 m) tall waterfall on the river Jökulsá á Fjöllum. This waterfall sits downstream from the mighty Dettifoss, so it is often overlooked. Selfoss, while smaller in height, is immensely wider than Dettifoss, with a width of around 330 ft (100 m).