2 options:-
Burnt Farm Ride Loop - 10.68km / 6.63ml run
Car Park, Clay Hill, Theobalds Park Rd, Old Park Ride, Burnt Farm Ride, Spurs, Maidens Bridge, Forty Hall Trail, Cafe
https://gb.mapometer.com/running/route_5325107
Northaw Great Wood - 23.38km / 14.53ml run
Car Park, Clay Hill, Theobalds Pk Rd, Burnt Farm Ride, Cuffley Tennis Courts, Plough Hill, Ridgeway, Northaw Great Wood Yellow Trail Anti-Clockwise, Ridgeway, Trail to Cuffley Tennis Courts, Burnt Farm Ride, Hilly Fields, Cafe