Hello Chris! Overall this is looking quite nice so far. Hm, if those forests were created the way that I think they were, I'm not sure what to do to make them blend in with the terrain better. I've tried a few techniques to try and soften the edges, but haven't landed on a technique that I am satisfied with yet. However I have made some other suggestions in my second post "here" regarding the color and shading of these forests that you might be interested in.

Cheers,
-Arsheesh