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empty quarter

Leon McCarron, left, and Alastair Humphreys make their 1,000-mile crossing of the Empty Quarter, the largest sand desert in the world. They carried what started as a 660-pound cart full of water, food and supplies.

Crossing 1,000 miles of desert on foot

Alastair Humphreys is a British-born traveler who was named National Geographic Adventurer of the Year in 2012. In this exclusive account for Yahoo Travel, he recounts his 45-day desert crossing that is the subject of a documentary, "Into the Empty Quarter." (All photos are courtesy of Alastair Humphreys/Flickr)