The number of islands on Earth is so big that on one knows for sure exactly how many there are. Some of them, such as Greenland, Borneo, and Madagascar, are huge. Others are tiny: Just Enough Room Island, for example, which spans 3,300 square feet, is the world's smallest inhabited island. It lies in the Saint Lawrence River on the New York side of the U.S.-Canadian border. As The Washington Post had once noted, "One misstep and you're swimming."
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