Boon Island is a barren, rocky island in the Gulf of Maine 6 mi (9.7 km) off the coast of York, Maine, United States. The island, which is approximately 300 ft (91 m) by 700 ft (210 m) at low tide, is the site of Boon Island Light, at 137 ft (42 m) high, it is the tallest lighthouse in New England. Numerous vessels have been wrecked on its rocky shoreline. John Winthrop, the English Puritan lawyer and one of the leading figures in founding the Massachusetts Bay Colony, mentions passing Boon Island in the 1600s.