Feltwell St. Nicholas. The pecked red line following the course of the Little Ouse marks the county boundary of Norfolk and Cambridgeshire. Drawn on the left of the sheet; along the Ouse Valley; is a patchwork of arable land divided by straight water-filled dykes; typical features of the fens landscape. This elaborate system of drains and river diversions was designed in the 17th century by a Dutch engineer called Vermuyden. It made possible the conversion of pasture to arable land in this regionPen and ink on paper.1813.OSD 238London; British Library.