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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

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

We haven't written up this one. Quartz has the full story — the link below goes straight to it.

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