Whenever I plan a trip to a scenic country I use several resources: guide books, geo-tagged photos found on the web and, what I've recently added to my toolbox, waterfall databases. The latter allow me to add additional points of interest to my itinerary, which sometimes happen to be little gems unknown to the wider public. And here is one example of such. Somewhat off the beaten track, apparently this waterfall doesn't even have an official name. There's not even a path leading to it from a nearby rest-stop. In order to find it, you must know beforehand it exists. But if you do, it's just a matter of following down a stream.
Sometimes this waterfall is referred to as Selvallafos because a nearby lake is called Selvallavatn. (2015-06-03 Snæfellsness Peninsula, Iceland)