The Snow Lake trek is an extremely challenging proposition. Crevasses on the Biafo and Hispar Glaciers have claimed lives, and blizzards, whiteouts, and tricky, crevasse-obscuring snow cover are possible throughout the year. Even with a guide, you'll need solid route-finding, compass-reading, and rope skills. It's called Lupke Lawo, or Snow Lake, and it's not just a lake but a ten-mile-wide glacial basin at 15,000 feet, ringed by the jagged high peaks of the Karakoram Range.

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