Flathead Lake offers you plenty of room to play – in, on, and by the water. Located just south of Kalispell, the largest natural freshwater lake west of the Mississippi is 28 miles long and up to 15 miles wide. That’s 188 square miles of pure enjoyment! The lake’s sparkling waters and miles of tree-lined shore offer unlimited recreational opportunities and wildlife habitat. Overlooking it all are the magnificent Swan and Mission mountain ranges.