The one, the only, the beautiful lake Coeur d'Alene. Located in north Idaho, this incredible body of water is over 26 miles long with 135+ miles of shoreline. The lake is fed primarily by the Coeur d'Alene River and the St. Joe River, and its outlet forms the Spokane River. Sunsets on Lake Coeur d’Alene are gorgeous – promising a spectacular ending to your journey to the inland Northwest.