The World Championship Snowmobile Derby is the World championship snowmobile race. It is held at the World Championship Derby Complex,[1] formerly known as the Eagle River Derby Track, along U.S. Route 45 in Eagle River, Wisconsin on the third weekend in January. Eagle River is known as the "Snowmobile Capital of the World" because it hosts the Derby.[2] Eagle River is located in the same county as Sayner, Wisconsin, the place that Carl Eliason invented one of the first modern snowmobiles.[3]