The Île Sainte-Marguerite (pronounced [il sɛ̃t maʁɡ(ə)ʁit]) is the largest of the Lérins Islands, about half a mile off shore from the French Riviera town of Cannes. The island is approximately 3 kilometres (1.9 miles) in length (east to west) and 900 metres (0.56 miles) across. The island is most famous for its fortress prison (the Fort Royal), in which the so-called Man in the Iron Mask was held in the 17th century. (read more on Wikipedia)
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