Quote Originally Posted by jonv112
Do you mean a vanishing edge pool? A vanishing edge pool is a pool where a section of the wall is below the water level so that the water falls into a trough below to creating an optical illusion. It can be made so that it looks like the pool is blending in with the sky(if located on a mountain), or blending in with a lake or large body of water. Hope this helps.

You can check out the Vanishing Edge pool gallery here:

http://www.masterpoolsguild.com/gall...olfeatures.asp
That could be it, thanks , those are some very nice pools!