Háifoss was once believed to be the tallest waterfall in Iceland at a height of 396 ft (121 m). Háifoss only ranks as the 9th tallest waterfall.

Gullfoss is the largest waterfall in Europe with an average flow of water is around 49,441 ft³/s. Gullfoss is fed from the wide Hvítá river.

Urriðafoss is Iceland’s largest waterfall in volume, with a high river drop rate of 12,700 cfs (360 cms). The waterfall is located on the Þjórsá, the longest river in Iceland. In Icelandic, Urriðafoss translates to “Trout Waterfall.” The Þjórsá is a famous river for salmon and trout fishing. Even seals are reported to travel up the river to Urriðafoss to catch salmon.