4. The prescribed area shall consist of the catchment areas in Strathclyde Region of the Rivers Annick, Irvine, Gogo Water, Noddsdale Water and certain other waters, and that part of the catchment area of the River Garnock which excludes the waters below the march fence to the south of Dalgarven Mill at Ordnance Survey NS 2965-4564 and the Lugton Water below the footbridge at Montgreenan Mains at Ordnance Survey NS 3417-4490 to its confluence with the River Garnock, and is delineated by a continuous blue line on the map.