Translated into English the name of this waterfall is The Troll Waterfall. It´s in the river Grímsá which is in Borgarfjordur on the west coast of Iceland. This picture is taken from a restaurant which is just on the bank of the river call Tíminn og vatniđ or in English Time and water and belongs to a farm called Fossatun. (if you want further information about this place, they also have a camping site there, you can look at their website http://www.steinsnar.is)