Merging two landscapes together at one side seamlessly?

Hey guys, is there a way to merge two landscapes together at one side seamlessly? Since i have the basic version of world machine, I am restricted to landscape size 505 x 505 which is way to small for my liking. Then I thought why not merge them together in Unreal? Can someone show me step by step on how to do this (if possible)?

here’s a visual of my question:

Did you ever figure this out? I’m stuck with the same issue.

i have heard that if you export the 2 landscapes as height maps merge them in photoshop, and import them back into unreal works