How to glue a landscape to the landscape?

Development World Creation
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1

I want to attach one landscape to another. How to do that?

2

So, you basically want to merge the borders? I think this is only possible by exporting both heightmaps, merging them together in Photoshop and importing the result.

3

thx for your answer! But i need another. I want to merge maps. I want to merge from different maps to collect one big.