Fossabrekkur is a green oases with many small waterfalls over a wide of 150 meter. The waterfalls are located next to road 26 near a more known waterfall Tröllkonuhlaup in the region Suðurland, Iceland.
Driving on road 1 (north of Hella) take the exit to Galtalaekur, onto road 26. From here it is a 46 kilometer drive to a small dust road (at the right side) that leads to Fossabrekkur (gps 64.077144, -19.760895). I think there is a small yellow sign pointing to the waterfall.