Tks, Forester (and you are truly good at this stuff!), for the reply. That's a good suggestion. But are there any good ways of controlling this "digging and raising" of this flat terrain? And if it's flat, you can't really dig much, can you? OK, another example... I want to make a stream that curves and winds its way into the background. And I want some of the land to gently slope down to it and in other places I want erosion to have carved out a much steeper slope (like on the outside curve of the stream where the rains have caused erosion). Can one do this in the editor? Or do they lay out a greyscale bitmap in PS or PSP? I'm sorry to be a bother.