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Flathead Lake is the largest lake in the western part of the coterminous United States, surpassing Nevada/California's Lake Tahoe by .5 miles in surface area, 5 miles in length, and about 3.5 miles in width, Flathead Lake is also the largest lake in the state of Montana. This lake is one of the cleanest in the world for its size and type. [1][2] While the Great Salt Lake is technically larger than Flathead Lake, the former is a natural salt lake or inland sea while Flathead Lake is a freshwater lake.