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The Baja California peninsula appears on some early maps as an island but was later discovered to be attached to the mainland of North America; likewise Banks Peninsula off the South Island of New Zealand which was originally called "Banks Island" by Captain James Cook.
The 1728 edition of a map by Johannes van Keulen shows the strait north of the Island of California with the note that 'they say that one can come through this strait to Hudson Bay, but this is not proven.'