The National Three Peaks Challenge is a mountain-endurance challenge in Great Britain, with a history of over 40 years, in which participants attempt to climb the highest peaks of each of the island's three countries. Whilst the challenge has no official rules or time restrictions, many participants try to complete it within 24 hours, or more leisurely over a weekend, using motorised transport to travel between the mountains. Some participants choose to start and finish the challenge at sea level, whilst the majority simply start and end at the foot of the first and last mountains. The mountains climbed, in order of elevation, are Ben Nevis in Western Scotland, 1,344 metres (4,409 ft), Snowdon in North Wales, 1,085 metres (3,560 ft), and Scafell Pike in North-Western England, 978 metres (3,209 ft).