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They cant have any bases at the entrances reverse mountain, the reason why they call it the red line is you cannot approach any other part of reverse mountain except the four entrances without crashing. If you look back at chapter 101, its pretty much a massive cliff/cayon setting and as far as i know: you cannot stop without dying on the way up the mountain. Anyways its not like reverse mountain is a very commonly used entrance anyways, all of the weaker pirates at the time fear the grandline.
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