Three hundred and eighty-six people have participated in the Yukon Quest, an annual international 1,000-mile sled dog race between Fairbanks, Alaska and Whitehorse, Yukon. It has been called the "most difficult sled dog race in the world" and the "toughest race in the world". The race's route follows the Yukon River for much of its course and travels over four mountains: King Solomon's Dome, Eagle Summit, American Summit, and Rosebud Summit. Its length is equivalent to the distance between England and Africa, and the distance between some checkpoints is equivalent to the breadth of Ireland.