Hvítá (Árnessýsla)

The river flows for 40 kilometres (25 mi) before dropping down into a narrow gorge at Gullfoss waterfall.

It proceeds to run through the flatlands near Grímsnes [ˈkrimsˌnɛːs] and behind Ingólfsfjall mountain.

Just north of Selfoss town, it meets Sog River where it becomes Ölfusá as it flows into the Atlantic Ocean.

Organised rafting excursions take place on parts of the river.

The river is bridged at 4 locations, thrice at the lowland and once near the source in the highland where it is only open over the summer.