I'm starting to get the hang of combining nodes in various ways, but I can't figure out how to combine (for example) a snowy peak with a river system, or a sea node with textured land, or even make a river system play nice with the lakes they should be flowing into.
Any method I use to combine the nodes results in losing the water or snow. I've managed to fake it by using a height node to screen a blue SatMap, but the sample pics give the impression that there must be a way to keep the water or snow created by the node.