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In page Copper Island:
"The phrase "Copper Island" was also used, especially in the 18th century, to describe a possibly mythical island in Lake Superior where there is an abundance of copper sitting on the surface of the land. While some scholars believe this was a reference to Isle Royale, the "island," because of its abundance of copper, could also have been the northern Keweenaw Peninsula,[1] especially given the presence of vast quantities of native copper in the region.[citation needed]
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