Challenges
100 in 100highlight qualifying block100
10 in 10SVN ten-day sequence10
52 in 52one-year challenge52
County challengeUK & Ireland coverage50+
Map key
Road marathonTrail marathonUltra / 50K+Multiple classifications
Repeated editions are spiralled tightly around their real venue so each remains clickable. Location takes precedence over county/state. Reset View returns to the complete world view without changing filters.