The Dartford Half Marathon has happened every July since 1977. The race features a challenging undulating course starting at the Dartford running track heading out onto the surrounding roads before heading back into Dartford finishing at the same place the race started.

http://www.dartfordharriersac.co.uk/dartfordhalf2.html

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Calories burned during this run: 861

This is based on the average human weight (80kg / 175lbs) and average running speed (9mph).
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