The Flathead and Swan rivers supply clean fresh water to Flathead Lake year-round. Created by Ice Age glaciers, almost thirty miles long and fifteen miles across at it's widest point, Flathead lake is the largest natural lake in western U.S.  A 160 mile shoreline and water covers nearly two-hundred square miles of Montana - and at 300 feet deep, you'd better restring your fishing reel with some extra line.
Flathead Lake lies in the shadows of Glacier National Park and Whitefish Mountain ski resort to the north. Two scenic highways parallel the lake. On the west side, US Highway 93, and Route 35 on the east wind along the curving shorelines offering majestic views of the lake, mountains and the scenery that made Montana famous.  As a matter of fact, any view of Flathead Lake is a spiritual experience.

Credit: www.flatheadlake.name