N.J. Stat. § 40A:13-22
The governing bodies of the counties and the governing bodies of the municipalities concerned, or the governing bodies of the municipalities alone concerned, shall each adopt an ordinance or resolution, as appropriate, defining and consenting to the establishment of the same permanent boundary line, describing the line therein so that it can be recognized notwithstanding changes in the location of the center line of the stream, and authorizing the officials designated as the chief executive officers of the governing bodies of the respective counties and the chief executive officers of the municipalities concerned or the chief executive officers of the municipalities concerned, as the case may be, to execute for and on behalf of the respective counties and municipalities or of the respective municipalities concerned an agreement setting forth the dividing line as so fixed. The agreement shall be filed and recorded in the office of the Secretary of State.
N.J.S. § 40A:13-22