Unspeakably beautiful wilderness at Yukon Quest International Sled Dog Race

Today a dog race begins at the top of the world in mind-numbingly freezing conditions, writes Jo Kerrigan.

At the top of the world in a remote, frozen wilderness, an epic event takes place every February.

The Yukon Quest International Sled Dog Race covers 1,600km between Whitehorse in Yukon Territory, Canada, and Fairbanks, Alaska.