Phantom islands are islands that are believed to exist and appear on maps for a period of time (sometimes centuries), and they are removed after they are proven not to exist (or the general population stops believing that they exist).
... Aniva. The native inhabitants consist of some 2000 Gilyaks, 1300 Ainus, with 750 Orochons[?], 200 Tunguses[?] and Some Yakuts. The Gilyaks in the north support themselves by ...