The uppermost falls in Ytri-Rangá river are called Fossabrekkur. The falls are just below the western source of the river just after entering the common land of the Landmannaafréttur. Fossabrekkur are a fertile oasis in the barren pumice landscape. It is necessary to drive to the location to see this gem, as it is well hidden. Fossabrekkur is a unique and beautiful location where the western arm of Ytri-Rangá fall off the rocks into the eastern arm and runs thereafter in a single channel almost all the way to the sea.