Here's one to start this thread off -- I was entranced by the glass-like quality of the water as it slid over the sills in this river near Hartington, in east Staffordshire.

http://i23.photobucket.com/albums/b3...60img_4449.jpg

This is the mouth of the Afon Dwyryd, taken from the north shore, in Portmeirion, North Wales.

http://i23.photobucket.com/albums/b3...56img_4030.jpg