A body of water at this altitude, with steep mountains as far as the eye can see. Magical. The layers of color add to the image's impact, dark stone in the foreground, then blue mountains in the distance, and finally the red-streaked sky. A great shot.
Excellent shot! The lake looks so lovely that it's easy to overview that it is artifical. A big concret wall (175m high) keeps the water back for a power plant. By the way, did you get up by road or railway?