The Welsh 1000m Peaks Race takes place on the first Saturday in June each year.
The 32 km route is also known as the Snowdonia Summits Marathon as competitors have to reach the top of all the 1000 metre peaks in Wales.
The idea was the brainchild of Ron James, the warden of Ogwen Cottage Outdoor Pursuits Centre, along with Dr Ieuan Jones, who invited 60 people to participate in a trial event in 1970.
Both finished on the summit of Snowdon after which entrants were still responsible for their own safety and descent to the valley.
[4] The fastest times are 3h 27m 20s recorded by Gavin Bland in 1999 and, for women, 4h 2m 39s by Angela Mudge also in 1999.