The "Titlow Beach Marine Preserve Area" is defined as all waters and tidal and submerged lands within a line beginning at the mean high water line at the southernmost point of the Tacoma Outboard Association leasehold, then projected due west to the intersection with the outer harbor line, then following the outer harbor line to a line projected due west from the old ferry dock at the foot of the Sixth Avenue extension, then east on said line to the mean high water line, then following the mean high water line to the point of origin.