Note: Australia is generally considered to be a continental landmass, rather than an island. If however one does count Australia among the islands it, not Greenland, would be the largest in the world (unless one also considered Antarctica an island).
... US explorer
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Vasco Nunez de Balboa, (c. 1475-1519), (- Spanish, first to sight the Pacific Ocean, founded Darién, oldest surviving European settlement in ...