I just love the color of tannin-rich rivers! Tannins are commonly cited as being the cause of root beer colored water. The Presque Isle River in Michigan's Porcupine Mountains Wilderness State Park has some of the most delicious-looking root beer colored water that I've ever seen! This photo shows one of the first ledges of many that make up Manido Falls. This was an incredible waterfall to photograph using my 100-400mm lens and I easily could have spent the whole day photographing just in this one area. Alas, I had to hit the road for home after a few hours of shooting in the early morning light.