The name hraun comes from the Icelandic word for lava. The Hraunfossar are situated near Húsafell and Reykholt and lava-tube cave Víðgelmir is close by.
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Hraunfossar (Borgarfjörður, western Iceland) is a series of waterfalls formed by rivulets streaming over a distance of about 900 metres out of the Hallmundarhraun, a lava field which flowed from an eruption of one of the volcanoes lying under the glacier Langjökull.
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The waterfalls pour into the Hvítá river from ledges of less porous rock in the lava.
Hvítá, Borgarfjörður in the west of Iceland, near the Reykholtsdalur (see Hraunfossar),