Changuu Island, also known as Prison Island, is a small island located just off the coast of Zanzibar, Tanzania. The island is known for its crystal-clear waters, pristine beaches, and rich history. Originally intended to be a prison for rebellious slaves in the 1860s, the island was never actually used for this purpose. Instead, it became a quarantine station for yellow fever cases. Today, the island is a popular tourist destination, offering visitors the chance to explore the historic prison buildings, relax on the beautiful beaches, and snorkel in the surrounding waters.