Selfoss is a waterfall on the river Jökulsá á Fjöllum in the north of Iceland. The river drops over a number of waterfalls over about 30 km before flowing into Öxarfjörður, a bay of the Arctic Sea. The river originates as melt water from the glacier Vatnajökull and therefore the water flow varies depending on the season, the weather and volcanic activity.
A few hundred meters downstream of the Selfoss waterfall (11 metres (36 ft) high), the Dettifoss waterfall is situated, the most powerful waterfall in Europe. The river falls 44 metres (144 ft) over a width of 100 metres (330 ft). Below the falls, the river passes through a gorge which is part of the Jökulsárgljúfur National Park.
- "Over the edge: Extreme kayakers who laugh in the face of the world's most powerful waterfalls". Daily Mail. Retrieved 1 November 2014.
- "Sunrise on the Selfoss waterfall". National Geographic Magazine. National Geographic Society. Retrieved 1 November 2014.
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