The area within an imaginary line commencing at a point (50°15′50.51837″N, 005°17′31.53797″W) then in a straight line in a south westerly direction to a point at the northern end of the pier (50°15′49.09131″N, 005°17′34.40843″W) then following the seaward side of the pier along the level of high water and then in a southerly direction to a point (50°15′40.92978″N, 005°17′30.75737″W), then following the level of high water around the two tidal basins and turning basin (along the north eastern side) back to the point of commencement (50°15′50.51837″N, 005°17′31.53797″W) and the harbour premises, as shown outlined red on the Portreath Harbour Limits Plan.

The area within an imaginary line commencing at a point (50°10′43.64932″N, 004° 58′16.91173″W) then in a straight line in a north easterly direction to a point at (50°11′08.41656″N, 004°58′06.31798″W) then following the level of high water along the coast back to the point of commencement (50°10′43.64932″N, 004°58′16.91173″W) and the harbour premises, as shown outlined red on the Portscatho Harbour Limits Plan.

The area within an imaginary line commencing at a point (50°21′40.44036″N, 004°18′53.92665″W) then following the level of high water around the northern edge of the harbour to the northern edge of the quay and then in a straight line in an easterly direction to a point at the north eastern end of the quay (50°21′40.23610″N, 004°18′50.65529″W) then following the seaward side of the quay along the level of high water to a point (50°21′39.95922″N, 004°18′54.16899″W), then in a straight line in a north east easterly direction back to the point of commencement (50°21′40.44036″N, 004°18′53.92665″W) and the harbour premises, as shown outlined red on the Portwrinkle Harbour Limits Plan.