The Northern Rolling Plains Boll Weevil Eradication Zone shall consist of the following area: all of Gray, Wheeler, Donley, Collingsworth, Hall, Childress, Cottle, King, Hardeman, Wilbarger, Wichita, Clay, and Foard Counties, and all of Archer County lying north of a line following FM 422 commencing at the Baylor County line running east to the intersection of FM 210, continuing east to the intersection of State Highway 25, and continuing east to the Clay County line.