11.8 miles (19 km) with 234m total ascent
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The path along Foxes Lane near Welham Green mentioned in point 13 below
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A half-day walk, keeping, as close as possible using public footpaths, bridleway, byways, permissive paths, and quiet lanes to the boundary of the historic parish of North Mymms in south Hertfordshire, which is
mentioned in the Domesday Book. Allow four to five hours.