All that area west of a line commencing at a point on Long Island Sound due north of the junction of Riverhead Road and Ridge Road; thence due south to said point; thence southerly along Ridge Road to Middle Country Road; thence easterly along Middle Country Road to William Floyd Parkway Extension; thence southerly along William Floyd Parkway Extension to Moriches-Yaphank Road; thence southeasterly along Moriches-Yaphank Road to Route 27A (Montauk Highway); thence due south to the Atlantic Ocean; except that area delineated as Level III.