Pattern in Hvítá river
Hvítá (white river) is an Icelandic river that begins at the Hvítárvatn glacier lake on the Langjökull glacier in the highlands of Iceland. The river flows for 40 km (25 mi) before dropping down into a narrow gorge at the Gullfoss waterfall.
After this, the river flows between the Biskupstungur and Hrunamannahreppur districts. Here, one can find the confluence of the Hvítá and three other rivers: the Tungufljót, the Brúará and the Stóra-Laxá, doubling the volume of the river. It proceeds to run through the flatlands near Grímsness and behind Ingólfsfjall mountain. Just north of the town of Selfoss it meets the Sog River where it becomes the Ölfusá as it flows into the Atlantic Ocean.