Many rivers of Iceland feature waterfalls, but the 206-meters long Jökulsá á Fjöllum (The Glacier Mountain River) streams over the biggest number of waterfalls. Namely, this north-eastern river gives birth to several waterfalls, including Selfoss, Dettifoss, Hafragilsfoss, and Réttarfoss. Dettifoss is particularly important as it is one of the most powerful waterfalls in Europe.