Ok, I did that, and the way I did was the following: I took a volume land plane... That was my terrain... Then I duplicated that and made it into a long strip... I made the long strip negative and the terrain positive... Nothing.. I wouldn't get the long strip you're showing here... So you're telling me, make the land plane positive, make the long strip the water plane, make it negative, but transferring material of negative boolean?? Any info appreciated... Thanks...