The River Bulbourne is a river in Hertfordshire, England. It runs in a south-easterly direction from Dudswell in Northchurch, through Berkhamsted, Bourne End and Boxmoor to where it joins the River Gade at Two Waters in Apsley near Hemel Hempstead. The total length of the river is 11 km (7 miles).Originally the source was close to the village of Bulbourne (which would make it 16 km long), but today it is from the springs above Dudswell.