Robbie Callister won the African Centurion Race Walk held on Robben Island, close to Cape Town, over the weekend.
The five-time Parish Walk winner completed 22 laps, a distance of 160.1km (100 miles) round the roads of the former penitentiary in a total time of 20hr 33min 40sec, averaging 7m 42s kilometres per hour.
Runner-up was his close friend and fellow Castletown man Andrew Titley in 21:51.24.