Those parts of North Yorkshire, West Yorkshire and South Yorkshire bounded by:

On the North by A684 from Hawes (via Leyburn) to the A1. The A684 to Northallerton. A168 from Northallerton to South Kilvington Roundabout (A168 / A61)and a straight line to Ravenscar. On the South by the Humber and River Ouse to Old Goole. A straight line to M18 / M62 (Junction 35). M62 To (Junction 34) at A19, Whitley Island. Straight lines to A628 / A638 at Ackworth Moor Top Island, to A628 / A629 at Hoylandswaine Island. The A628 to the Yorkshire Boundary at Salters Brook Bridge. On the West by the West Yorkshire / Greater Manchester boundary to Blackstone Edge at the A58 / B6138 junction and then straight lines to Earby / A56, Earby to Clapham / A65 and Clapham to A684 at Hawes.