Kúðafljót, a big glacial river formed by the rivers Eld­vatn, Tungufljót, Hólms­á and Skálm. About 4 km wide and difficult to ford before it was bridged, because of quicksands.

Seals and trout in the river mouth.

The Irish settler Vilbaldi had a boat named Kúði, from which the river gets its name. It is thought the boat may have been an Irish coracle.