The Monsey/Rockland Eruv map indicates one large karfif (in red). A karpef/karfif is as an area not designated for residency which invalidates an encompassing eruv if it is not itself separated by a distinguishing barrier and is greater than 5000 square amoth (~10,000 sqft.; see e.g. here) However, the Rockland eruv seems to be filled with many such wooded and unused areas (e.g. here, here, here, etc.) or lakes (e.g. here, here, here, etc.). So what distinguishes the demarcated karfif from these other uninhabited areas?

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    Great question, you can email Rav Yosef Viener (choshuv Rav in Monsey) through his publicly available shiur site : Yv@torahstream - dot- org
    – NJM
    Jun 16 '17 at 22:27
  • They prob rely on different Kulas, like on a lonely dilapidated shack that can make the Karpef into a Hukef ledirah. Or if they are recreational areas according to R Moshe they can be included in the Eiruv. see "The laws of Eruv" by shlomo francis and yonason glenner, pp. 153-155. I don't know what the case in Monsey, in particular, is though.
    – Bach
    Jun 18 '17 at 14:06
  • @bach I'm pretty sure a lot of these are just large, unused and undeveloped areas of woods, etc.
    – Loewian
    Jun 19 '17 at 0:13

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