Long Island is the biggest island by far in the Long Island archipelago. This archipelago may not be a true archipelago like the Galapagos in the South Pacific off Ecuador or the Channel Islands off Southern California in the middle Pacific or the San Juan Islands off Washington in the northern Pacific. The status of Long Island as an island has long been in doubt, separated as it is from the rest of New York by the East River. The United States Supreme Court — lawyers, mind you, not coastal geologists or geographers — ruled 9 to 0 that Long Island is not an island but part of New York State’s mainland.