From Union Glacier to Death Valley: 10 tough races for long-distance runners

Summary
These 10 tough marathons around the world, from Antarctica's Union Glacier to Everest Base Camp, test runners with ice, altitude, desert heat, stone steps and wildlife
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From Union Glacier to Death Valley: 10 tough races for long-distance runners
These 10 tough marathons around the world, from Antarctica's Union Glacier to Everest Base Camp, test runners with ice, altitude, desert heat, stone steps and wildlife


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