I'll try to do some screen prints of my settings when I get home. Going out of town for the weekend. Benettor has the right idea. Ggrace's pic looks pretty close. I used a bunch of copies of the first terrain to get the water going back into the distance. I also put a water plane underneath. The two pics I did both used volumetric atmospheres and it seemed to show the reflections on the water better. Yes you start with a glacier terrain because that gives you a nice flat terrain. Then you hit the function tab in the upper right corner. You have to edit the function which takes some getting used to, but the chipped function is what scoops out the nice valleys to make the top of your glacier wavy. I had tried smooth noise and fractal before but never got anything that looked like waves. Good luck!