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They're not close to each other. Bigface mystically teleported Abe. And don't mention the map; it's been proved incorrect often enough that we really can't count it as canon.
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Bear in mind that a) Until you mentioned this idea a couple of months back, it had never been mentioned on the Forums and b) it clearly didn't occur to the people who made Abe's Oddysee and the Oddworld Map that Big Face teleported him.
EDIT: Also, c) Why would Big Face stumble across Abe if he hadn't just landed outside Monsaic Lines?