Hraunfossar (Lava Falls). This was unlike any waterfall we have seen before. Glacial melt water flows beneath the solidified Hallmundarhraun lava field (from a volcanic eruption circa 800 AD), and emerges from the face of the rock cliffs over the course of a kilometer. The water forms beautiful waterfalls, gorges, and turquoise pools as it tumbles into the Hvita (White) River. It was a humbling sight.