Ascension: I did as you suggested, but wasn't happy with the end result. I suspect I was a bit ham-handed. I removed a large number of hills, and don't regret that a bit, but the brown-shading was perhaps a bit over the top. I am not a good judge of that and have to substitute experience for instinct.

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Lathorian: I understand the technique you describe. It is one that Ascension uses all the time, though I am not sure what tool you're referring to. However, can you tell me what I am picking in order to expan upon? Something to keep in mind is, though my rivers follow the terrain as well as I could manage, they are not actually a function of the terrain or the height map underlying the map.

I apologize for not "getting it".