The waterfall Haifoss in the Thjorsa Valley is 122 m high, probably the second highest one of the country. It remained nameless until the turn of the 19^th century, when it was named by the naturalist Dr. Helgi Petursson. Just a stone’s through further east, another lower waterfall, Granni (The Neighbour), drops down into the same gorge.

The best access is from the 4wd road above the waterfalls, but people have to be careful on the brink of the gorge. The waterfalls are also accessible from below, also by a 4wd track from the excavations at Stong or the swimming pool at Rauduskridur.