7. Flathead Lake – Montana
Flathead Lake is one of the largest natural freshwater lakes west of the Mississippi. It is located near Glacier National Park and offers wide, open views of mountain ranges and peaceful farmland. Visitors enjoy boating, fishing, and quiet lakeside parks.
Its clear water and low population around the shore make it feel wild and open. It’s especially popular in summer when fruit stands and local markets open up near the lake’s edges.