Jökulsá á Brú or Jökulsá á Dal, a glacial river, at 150 km the longest river in eastern Iceland. Considered the muddiest of Icelandic rivers, it carried about 112 tons of clay and sand to the ocean daily. The river is reduced in volume, both water and deposits, when the generators of the Kárahnjúkar Hydroelectric Power Station started to revolve. The deposits will remain behind the gigantic dam in the river’s canyons and the mainstay of the water will be diverted to river Lagarfljót.There are five bridges over the river.