Michigan is the only state to consist of two peninsulas, separated from the Straits of Mackinac, a 8km channel that joins Lake Huron to Lake Michigan. The state has the longest freshwater coastline of any political subdivision in the world (almost 5,000 km), being bounded by four of the five Great Lakes, plus Lake Saint Clair. It has also more lighthouses than any other state (about 150). The first lighthouses in Michigan were built between 1818 and 1822, to project light at night and to serve as a landmark during the day to safely guide the ships traveling the Great Lakes.
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