They start off at Conwy Castle and end up in South Wales - 315km (about 196 miles for the metrically challenged) away with 15,500m of height gain across wild, trackless, remote and mountainous terrain.
The event organisers expect the fastest competitors to be running for approximately 8-9 hours each day and the slowest competitors (who complete the full course) to be running and walking for approximately 13-15 hours each day. Competitors pay several hundred pounds for the privilege of taking part.
It was first run in 1992 and it took 20 years until they recovered to do it again in 2012. It was also run two years ago making 2017 the 4th occasion.
|Catching their breath at Campbell's Kingdom 2015|