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Sbuilderx and ocean side of airport single question.

Hello everyone,
happy Sunday for all.

I have a small issue which I can't find solution. I have my airport next to the ocean and I have ab_flatten terrain next to it because it's extra land the simulator provides and I've flatten down speifically down to the satellite image provided in Sbuilderx to match real life size.
So, after masking my satellite imagery, I still see the land.
What is it that I must do to completely eliminate this land on the border of my airport?

Thank you


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