N.J. Stat. Ann. § 40A:13-3

Whenever it is necessary for any reason to determine the boundary lines or a portion thereof between adjoining counties, the governing body of one county may, on 30 days' notice in writing signed by the official designated as the chief executive officer of the governing body to the governing body of the other county, apply to the Superior Court for the appointment of commissioners to survey, ascertain and mark the boundaries in conformity, as nearly as may be, with the laws creating the counties.