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Never knew this before , thanks for the info

What is the island associated with North America?

All the three? Based on geography(continental plates) or politically?

That's quite interesting, but one of my Portuguese friends doesn't believe that. :)

Portugal is a part of Europe. Madeira is a part of Africa. The Azores (an archipelago consisting of 9 islands) is located at the boundaries between three continents, with 1 island in Europe, 2 islands in North America, 3 islands in Africa