North America Arrowhead 135 Leadville 100
South America
104
Patagonian Expedition Race
106
Jungle Marathon
109
Western States 100
Race Across America
115
Tevis Cup Ride
South Pole Race
122
125
Yukon Quest
4 Deserts
135
Freediving
146
6633 Extreme Winter Ultra Marathon
182
190
Adventure Racing World Series
142
180
185
Volvo Ocean Race
139
Badwater Ultramarathon
194
198
VendĂŠe Globe
202
150
Ultraman World Championships
Index
154
Self Transcendence 3100 Mile Race
001_009_WToughestChallenges_prelims.indd 5
176
Woodvale Challenge
Furnace Creek 508
174
Cross-Continent
128
131
Yukon Arctic Ultra
171
The Extreme World Races
24-Hour Track Race Iditarod
167
Antarctica
118
Manhattan Island Marathon Swim
162
La Ruta de Los Conquistadores
112
Catalina Channel Swim
160
157
206
Acknowledgements
208
30/5/12 17:24:35