This is the Red sea at a town called Dahab (Egypt). It was beautiful and serene afternoon, the sea was so quit with a quite misty breeze, it was quite misty and foggy actually, thats why you don't see the horizon, on the other side there are supposed to be some mountains, but it was not visible at all. the sun was setting behind me and sending its final rays to glow the fog on the horizon. The moon was starting to be visible, it was a beautiful full moon (you can see it on the left).
The black dot on the right is some boat wreck in the sea.
Tech details: 51 sec exposure with cokin gradual tobacco filter and B+W C. polarizer @ f/13 and ISO 200.