Beautiful, peaceful evening on the shores of Flathead Lake, watching the sun set behind Cromwell Island. 🌅 Flathead Lake, with almost 200 square miles of surface area and 185 miles of shoreline, is the largest natural freshwater lake west of the Mississippi River — Yes, even bigger than Lake Tahoe! To our knowledge, Cromwell Island, with almost 350 acres and nearly three miles of shoreline, is the largest private island in freshwater west of the Mississippi River that is under a single ownershi