Large worlds are always interesting to lurk in on. But ^this^ is a potential game killer… So it really needs to be looked at now, even before the visual aspect. Interested to know… Apart from biome (foliage / rivers and so on), what’s the ultimate goal… What’s the plan for the terrain when its done… How do you plan to populate it all with interesting stuff??? Have you looked at all the pre-existing marketplace plugins too from landscapes to planets to voxels… Generally landscapes don’t perform well in UE vs meshes. 
Mosthost has written books about this. 
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