Exclave
Kentucky: The westernmost part of the state, a piece of land known as the Kentucky Bend, is surrounded on three sides by the Mississippi River, with Missouri on the opposite shore. Road access to the rest of Kentucky is only available by first going south into Tennessee.  This exclave exists because the Mississippi, which forms the boundary between Missouri (right bank) and Kentucky/Tennessee (left bank), crosses latitude 36°30', which is part of the border between Kentucky and Tennessee, three times.