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3. Just Room Enough Island, New York, USA

Tucked in the Saint Lawrence River along the Canada-US border, Just Room Enough Island is the smallest inhabited island in the world. At just 3,300 square feet, it has just enough space for a house, a tree, and a tiny beach. Originally bought by the Sizeland family in the 1950s as a private getaway, it quickly became famous, making privacy a thing of the past.