 The most influential of all such authors was Alfred Wainwright whose "Pictorial Guide to the Lakeland Fells" series has sold in excess of 2 million copies, being in print continuously since the first volume was published in 1952.Wainwright divided the fells into seven geographical areas, each surrounded by valleys and low passes.While any such division must be arbitrary- and later writers have deviated to a greater or lesser extent from this blueprint- Wainwright's sevenfold division remains the best known partitioning of the fells into 'sub ranges', each with its own characteristics.