Copper Island - Geography

Geography

The area was "isolated" by dredging in 1859 and construction in the 1860s of a ship canal across an isthmus of the Keweenaw Peninsula from Portage Lake—on the east side of the Keweenaw Peninsula—to Lake Superior on the west. The ship canal is 100 feet (30 m) wide and 21 feet (6.4 m) deep. The resulting "island" was called Kuparisaari (meaning "Copper Island") in Finnish, Irish and French/French Canadian settlers to the area. However, neither the United States Geological Survey nor the state of Michigan identify this area as an island or use this name. Isle Royale is the largest naturally isolated island in Lake Superior. However, considered as an island, Copper Island is the largest island in Lake Superior.

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