Iditarod Trail Sled Dog Race differ by less than . The northern route first passes through Cripple, which is from Anchorage, and from Nome (ITC, "Northern"), making it the middlemost checkpoint. From Cripple, the route passes through Sulatna Crossing to Ruby, on the Yukon River. Ruby is another former gold-rush town which became an Athabaskan village. The southern route first passes through the ghost town of Iditarod, which is the alternate halfway mark, at from Anchorage, and from Nome (ITC, "Southern"). From Iditarod the route goes through the three neighboring Athabaskan villages of Shageluk, Anvik, Grayling, and then on to Eagle Island, Alaska. Ruby and
Iditarod Trail Sled Dog Race #2, only experienced mushers are allowed to compete in the Iditarod. Mushers are required to participate in three smaller races in order to qualify for the Iditarod. However, they are allowed to lease dogs to participate in the Iditarod and are not required to take written exams to determine their knowledge of mushing, the dogs they race or canine first aid. If a musher has been convicted of a charge of animal neglect, or if the Iditarod Trail Committee determines the musher is unfit, they are not allowed to compete. The Iditarod Trail Committee once disqualified musher Jerry Riley for