The Dartmoor Discovery is an ultramarathon run around Dartmoor in early June (recently the first Saturday in June). The race is entirely on roads. It starts and finishes in Princetown, famous as the home of Dartmoor Prison. The current distance is 52.115 km (32 miles 674 yards). Entrants are required to have completed a Marathon on an 'average' course in less than 5 hours (or something equivalent). The 2010 race was the twelfth running of the race. There is a limit of 200 entries for the race.