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).
... Y
22 Z
A
Roald Amundsen, (1872-1928), Norwegian, first at the South Pole, first to navigate the Northwest Passage in a single ship
Roy Chapman Andrews ...