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county, northeastern New Jersey, U.S., bordered by New York state to the north and the Pequannock and Pompton rivers to the south; the Passaic River, which crosses the southeastern portion of the county, forms part of the southern and eastern borders. The terrain of the rural northwestern arm of the county is more rugged than that of the populous southeastern arm; the northwest also has numerous lakes. Oak and hickory trees predominate throughout the county. Recreational areas include Wanaque Reservoir, Greenwood Lake, Ringwood and Wawayanda state parks, and Abram S. Hewitt and Norvin Green state forests.