MORE than 500 rowers are set to tackle the tenth anniversary Rowers' Revenge Triathlon in Higginson Park, Marlow on Sunday, starting at 10.30am.

Each competitor faces the challenge of a 4000m row on an indoor rowing machine, followed immediately by a 25kilometre cycle ride out of Marlow, via Frieth, Fingest and Hambledon.

They then return to the park to finish off with a grueling 7.5 kilometre run, which takes them over Marlow Bridge, through Bisham, returning to Marlow via Temple Lock.