They are on the list. An ever growing list. Any more suggestions then let me know.
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100 miles in the Alps, one of the toughest 100's there is
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Fucking Insane
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Oldest and most prestigious 100 miler in the US
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Clue is in the name really
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Another hilly 100 miler (26000 feet) and one to complete the Grand Slam
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350 miles, in the snow
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64 days of running at least a marathon. From Southern Italy to Northern Norway.
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BR 135 Ultra is extremely difficult because it takes place in the Serra da Mantiqueira mountains, with only 20 km of the 217 km being run without any inclination. Elevation more than Everest
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135 miles across the Arrowhead Region of Northern Minnesota from International Falls near the Canadian border to Tower, an aread nicknames "The Icebox of the Nation"
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The Skeleton coast is famed for its hostility. The challenge is to complete in 24 hours.
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Stunning looking run through an Inca trail, at high altitude.
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256k run across Sweden. Minimal support.
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Non-stop 200 mile race in a different desert each year
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44 day 3000k ultra for "elites" only
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Not quite what the name suggests...
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Race across the breadth of the USA, from LA to NY
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A race worth a flight to South Africa for. Possibility of running with Lions...
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Another stateside 100 miler and part of the Grand Slam of 100's
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Clue is in the name too, very hot and hard terrain in Hawaii
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The Bob Graham Round of 42 peaks is one of the most demanding challenges in England. With a ascent of app' 28,500ft and a app' distance of 74 miles.
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135 mile race in the Himalayas with a pass of around 5000m
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246k Run from the Coast of Australia to some mountain. Sounds familiar..
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230 km along the coastline of Aquitaine, 6 stages between 25km and 60 km long
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Not too sure what this is cos the website is in Frenchish but looks cool
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115 km distance, and 5700 m D+ and 6700 m
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100k along a rift with high temperatures and gradients.