Full credit goes to Michael Puckett at TheSwamp for this verytip / trick....
In paperspace ...
Start with the outside viewport boundary, make it a closed pline. Turn it into a region.
Make the interior boundary that is the island you don't want to be visible from another close pline. Turn into a region.
Subtract region #2 from region #1.
Turn resultant region into viewport via mview [enter] object ...
Walla...


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