Dettifoss - Iceland
Dettifoss is the European waterfall with the largest energy content (Height x flow). The river drains the north side of the Vatnajökull glacier, hence the flow is particularly strong in the summer, when tourists are around. Because the river passes an area formed by large ash volcanoes, the water appears gray or black, and the erosion caused by transported material is so strong that no vegetation is able to get a foothold.
Less than one km above, there is another waterfall, Selfoss, which is almost as large. The fall is wider and formed as a horseshoe, but the characteristics are very much the same: Dramatic rock formations, gray water, no vegetation, and a beautiful waterfall.
Take a look: www.flickr.com/photos/ystenes/2982965755/
November 2009 this photo made it to the top of the list of the most "interesting" photos made with the Nikon Coolpix 995 camera: www.flickr.com/cameras/nikon/coolpix_995/
In fact taking over for another of my photos:
This photo appeared in Earth Magazine, November 2009, as subject for the "Where on earth" contest.
This photo was displayed on the weather report in the Norwegian TV station TV2 as winner of the daily photo contest in april 2010.