Ófærufoss waterfall or the Impassable Waterfall is a waterfall in the River, Nyðri Ófæra in Eldgjá, a 50 km long volcanic fissure that was formed in a massive volcanic eruption in the volcano Katla and Eldgjá fissure around the years 934 (934 to 936). The waterfall is located in the highlands of Iceland.
The waterfall is about 40 meters high falling down in two parts or levels. Until 1993 there was a stone bridge across the centre of the waterfall. The surroundings around the waterfall is very beautiful, formed by volcanic rocks and green moss.
It is possible to visit the waterfall during the summer usually from July to September depending on the road condition on the Mountain Road Nyðra Fjallabak (Road number F208 on to F223).
From the parking lot it is about 40 minutes walk along the volcanic fissure to the waterfall.