I created this after watching Dax's new video on erosion using the power of Vue and World Machine.
The original terrain was built in Vue as a procedural before converting it to a standard at a resolution of 4096 x 4096. I exported it as a height map which I brought into World Machine to erode.
The final height map has been applied to a standard terrain with a resolution of 4096 x 4096 pixels. The atmosphere is GR.