This is Lough Eske in County Donegal, Ireland at the end of the day on August 4, 2013. The GPS coordinates for where I was standing are 54.7034363,-8.0539525.
https://en.wikipedia.org/wiki/Lough_Eske#The_'Lough_Eske_Monster'
Same image on my web server: https://www.a-wee-bit-of-ireland.com/eire_2013/2013aug04_Eske_IMG_4251.html
