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First I used a fractal line to make my coasts, but when I tried to fill in the water and land, there was a gap. So I read someone's advice that it would be easier to make polygons and combine them to create the coast lines. I did that, and now I need to combine the polygons. However, the only feature I can find to do that doesn't actually fully combine the polygons. The help menu even says that adding too many together can really slow down a computer (which it is definitely doing).
Is there a way to combine polygons into a single polygon instead of the complex "polypolygons"?