Illinois: Carlyle Lake
Photo: Lake Carlyle from above. (Photo via U.S. Army Corps of Engineers Digital Visual Library / Wikimedia Commons)
Make no mistake, Lake Michigan is marvelous, but the Land of Lincoln shares it with multiple other states, and after all, they didn't call it "Lake Illinois". The largest lake located entirely within the state is the manmade beauty Carlyle Lake in the southern part of the state, and it's a heaven for boating, fishing and sailing.