Lough Tay, County Wicklow, Ireland. 26-4-2007.
Being an hour's drive away, Lough Tay is a favorite weekend spot for Dubliners. Much of the area surrounding the lake lies within the Guinness family estate. The white sand you see in this photo was brought in not to have an artificial beach for the family, but rather to provide the necessary contrast to bring out the lake's color, which resembles that of the other venerable Guinness; the beer, that is.
"The phenomenal color of the lake is quite common in the British Isles and Scandinavia-the black (actually very dark brown) is tannin staining from peat bogs in the river's upper catchment area. A similar phenomenon can be seen in Brazil near Manaus (pale with silt) where the Amazon meets Rio Negro (black river, little silt but tannin-stained water) and the two flow without mixing for many kilometers." (by Dr. James Parker)