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).
... (c. 1470-1521), leader of first expedition around the world
Douglas Mawson - Australian explorer of Antarctica
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Fridtjof Nansen, (1861-1930), arctic explorer, ...