Marquette Island is the largest of the 36 islands in the Les Cheneaux archipelago of northern Michigan, United States. Located in Mackinac County on the north shore of Lake Huron, the island has a small summer population. It is 6.5 miles long and 3.5 miles wide. Its geographic center is close to 45 degrees 57 minutes N., 84 degrees 23 minutes W.A narrow, freshwater sound, the Les Cheneaux Channel, separates Marquette Island from the Upper Peninsula of Michigan.
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Coordinates 45°57'39.52" N -84°23'23.855" E
