The Iditarod is an annual long-distance sled dog race that takes place in Alaska. The race covers a distance of over 1, 000 miles and is considered to be one of the most difficult races in the world. The primary form of transportation used in the Iditarod is sleds, which are pulled by teams of dogs. Sleds are the traditional form of transportation used by the indigenous people of Alaska and have been used for centuries.