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).
... Suffolk County, New York. As of the 2000 census, the town had a total population of 5,641.
Geography
Islip Terrace is located at 40°44'55" North, 73°11'11" West ...