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).
... of Persia to sail down the Indus River and around Arabia to Egypt
Ernest Shackleton, (1874-1922), attempted to reach the South Pole and came further south than anyon ...