Thanks Mike, I unchecked the ground plane. Didnt really work. But I think I did figure out the problem. The water shader I was using had a transparency value in it, so that demarcation was the edge of my terrain showing up underneath the plane. Howeverm even knowing that, I still can't get a decent looking expanse of water. Which brings me to a more general question: how do you make a decent looking ocean? I want to be able to set up a shot of the rocky cliff falling into the sea, and see the ocean stretch to the horizon. Any suggestions? Mike? Anyone? Bueler? Bueler? Cheers H&B