The National Three Peaks challenge involves climbing the highest mountains in Scotland, England, and Wales: Ben Nevis, Scafell Pike, and Snowdon. The total distance covered is approximately 23 miles (37 kilometers), with a combined ascent of around 3,000 meters (9,800 feet). Participants typically aim to complete the challenge within 24 hours, including travel time between the peaks. This popular outdoor activity attracts hikers and adventure enthusiasts, promoting physical fitness and teamwork while showcasing the stunning landscapes of the UK.