Dettifoss is a waterfall in Jökulsárgljúfur National Park of Northeast Iceland, not far from Mývatn. It is situated on the Jökulsá á Fjöllum river, which flows from the Vatnajökull glacier and collects water from a large area in Northeast Iceland. The falls are 100 m wide and have a drop of 44 m down to the Jökulsárgljúfur canyon. It is the largest waterfall in Europe in terms of volume discharge, having an average water flow of 200 m3/s.
(from Wikipedia, the free encyclopedia)