flathead-lake

Flathead Lake, in Montana

What’s the largest natural freshwater lake west of the Mississippi River? At 28 miles (45 km) in length, 15 miles (24 km) in width, 370 feet (113 meters) at its deepest and 124 miles (200 km) of shoreline the answer is Flathead Lake, in northwestern Montana. In all, it’s nearly 200 square miles (518 square …

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