Reply To: Large scale surface with high grounds and canals

I think I solved the problem in this way: I cut a simple geometry that follows the bottom line of the channels and the top line of the hills, then I added a more complex geometry with some Loop cut and slide, and then I added the subdivision surface modifier.

By means of some little adjustments I think I obtained a simple environment surface using a very few low number of poly and memory.

Should I need more complexity I could add some more particulars or a new geometry later.