The Hertfordshire Way: A Walker's Guide The 195 mile trail covers a large part of this beautiful, populous and rich county, incidentally one of the smallest counties in England, only 634 square miles. It is a county of rich contrasts. In the north-east there are wide open panoramas over low hills and farm lands as seen in the area around Barkway. Standing on Therfield Heath you can look down on to the flat plains of Cambridgeshire. BookWorm https://www.youtube.com/watch?v=SvvorfXBaz8&feature=youtu.be