Fellsfoss is a tiny stream waterfall of appr. 125 meters and is about 11 km east of Jökulsárlón on Breiðamerkursandur. By the farm Reynivellir you need to walk about 1,5 km to the waterfall.
There aren’t any pictures of the fall but it is possible to see the fall on Google streetview.
The waterfall near the farmhouses is more impressive, is more powerful. The river Baejargils drops down over the cliff for about 150 meters.