Trimming Default Terrain

Hi all, first time poster and general newbie so I apologize if I failed to search adequately.

I read through the manual on Trim, but that seems to be limited to lines. What I am attempting to do is trim a polygon, specifically a default terrain type over the default landmass. I drew a beach over the edge of an island, and I want the sand terrain to cut off right at the edge of the main land mass.

How, please, would I do this?

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