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Inspired by Is Juneau, Alaska -- surrounded by natural barriers -- a natural eruv

Is there a maximum square mile or square kilometer area that may be enclosed by an Eruv? (sources)

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I suspect that the size is relevant to the Juneau question, which is why I gave land-mass details, but also noted that most of the land is itself on an island, while the downtown area is in a smaller coastal area on the mainland. I believe that there are limits for an island -- I think you need to be able to see it all from a certain distance, but I'm not sure whether that could be from a mountain. – Bruce James Feb 18 '13 at 17:51

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