For the purposes of this chapter Bellmawr Borough is hereby divided into the following districts:

The areas within the Borough limits as assigned to each district and the location of boundaries of the districts established by this chapter are shown upon the Zoning Map which, together with all explanatory matter thereon, is declared to be a part of this chapter and shall be kept on file with the Borough Clerk.

The district boundary lines shall be as shown on the Zoning Map. Figures indicating number of feet appearing on said map between a road, street, avenue or railroad right-of-way and the boundary line of a district mean that the boundary line of the district at such location runs parallel with the street line of the road, street, avenue or railroad right-of-way at the distance therefrom indicated by the number of feet marked. Where said map indicates a district boundary approximately in a street, the center line of such street shall be construed to be the boundary. In each case of doubt or disagreement concerning the exact location of the boundary line, the determination of the Planning Board shall prevail.

When a district boundary line (other than one located in a street, avenue, road or railroad right-of-way) divides a lot existing on the date of the adoption of this chapter, the regulations and restrictions applicable to the less restricted district in which a portion of such lot is located shall apply to the portion of such lot located in the more restricted district for a distance of not more than 25 feet beyond such district boundary line.