Just a quick one. I've been noodling around with Blender more, trying to understand how the various nodes work and get them to achieve the look I'm going for on my own project.
Here is my erstwhile map configured using Sam Bowman's procedural terrain technique but using my height map to displace. The water needs work still and I'm trying out different ideas for how to mask out the rivers better.
One thing I finally figured out is how to view the effect of the Color Ramp by adding a viewer node. Shift+Ctrl+Left Click on the node you want to view and it will insert a viewer node for you. Now I can see where the mountains are getting their stone texture in white, for instance.