You won't be able to change it, this is there as a way to help performance. Its a lower quality texture that's used in places were not meant to go.
The reason you notice it is because it doesn't blend well. This would be extremely difficult and possibly impossible to blend to a point where you can't tell due to the size of the area. You will notice it a certain altitute no matter what.
This is better than the alternative and happens because we have a MASSIVE view distance in game, but not computers that can handle equally massive and high quality terrain.
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