(bah pardon typos, not very well) idea is to paint where it should be, (and any detials if wish), so you have a thin rim, then CLIP the terrain so it removes most of it: imagine slicing a tomatoe into thin parts across the middle. then place the rim on top of/in the water, change to a suitable material and voila', shoreline :) note: you may need to make this shoreline terrian have a high detial (1024x1024 or the like) to make it precise. It varies on the material, setting etc

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