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Volcanic and coral archipelago, southwestern Philippines, between Mindanao and Borneo. A double island chain, it extends 170 mi (270 km) and includes about 400 named islands and more than 500 unnamed ones; they cover an area of 1,038 sq mi (2,688 sq km). The islanders were converted to Islam by Abu Bakr in the mid-15th century. The Spanish tried, largely unsuccessfully, to subdue the inhabitants, whom they called Moros. The islands finally became a Spanish protectorate in the 19th century, and in 1899 came under U.S. authority. The archipelago was ceded to the Philippines in 1940. The islands have long provided a haven for smugglers.
This entry comes from Encyclopædia Britannica Concise. For the full entry on Sulu Archipelago, visit Britannica.com.