Im talking about when you import a height map and set the sea level, water comes in from all directions, is there some way (besides blocking with the raise tool on the map edges) to make it all come in from only certin sides? for example, I want to make a map of NYC were the water from the Hudson and Long Island Sound flow southward, but due to this mechanic water flows in from both directions (this is problematic as were would sewage water go but in the current-lees area were the to waters meet
example results:
Hudson were the harlem river branches off:
East river becomes lake betwwen harbor and roosevelt island:
example results:
Hudson were the harlem river branches off:

East river becomes lake betwwen harbor and roosevelt island:

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