Cat Tail Brook is a tributary of Rock Brook in central New Jersey in the United States.

Cat Tail Brook originates in Sourland Mountain at 40°26′26″N 74°46′2″W / 40.44056°N 74.76722°W / 40.44056; -74.76722.

[1] It flows southeast until it meets Rock Brook at the edge of Sourland Mountain at 40°25′55″N 74°43′44″W / 40.43194°N 74.72889°W / 40.43194; -74.72889.

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