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Franklin Lakes Nature Preserve is a 147 acre public nature reserve located mostly within Franklin Lakes, New Jersey, with a tiny portion extending into North Haledon, New Jersey. Situated between the First and Second ridges of the northern Watchung Mountains, the preserve occupies the site of the former Haledon Reservoir, which previously supplied water to North Haledon, Haledon, and Prospect Park. Passive recreation opportunities include hiking, fishing, and bird watching.