Grafham Water SwimRun

At Grafham Water 2025 is the 5k Fenland Runner Intro Swimrun, Monkey Sox Sprint 10k and the Precision Hydration Half 21k Swimrun. 

Undulating 5k, 10k and 21k courses and super open water swimming. 

The Grafham Water course has easy entry and exits into the water and amazing trail running through the woods and tracks around the reservoir. 

The courses head out along the north shore, with swims across the natural bays, runs through woods and around the reed banks. The  shorter courses then weave their way back along the north shore to the finish as the 21k heads off through the nature reserve and around the reservoir.