Route uploaded by John Armstrong.
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22.1 miles/35.4 km.
An out and back run. You don't need to make it all the way to High Barnet, turn round when you want. Since the route passes close by many Northern Line stations, it is easy to stop at practically any point.
A great route. It is strangely satisfying to conquer the Northern Line.
(Not risk-assessed for evening use)
