The Tröllkonuhlaup is a waterfall of Thjórsá in the south of Iceland. The waterfall is only 2 m high, but in the northwestern part 150 m wide. Then there are three small islands in the river and behind another 40 m of the waterfall. It is located about 5 km downstream of the Thjófafoss and barely 300 m west of the Landvegurs.(Wikipedia)