Question: Pedro Mascarenhas was the first to explore the island atoll that comprises what landform?
Related documents: [0]  [DOC] Dom Pedro Mascarenhas (1470 – 16 June 1555) was a Portuguese explorer and colonial administrator. He was the first European to discover the island of Diego Garcia in the Indian Ocean in 1512. He also encountered the Indian Ocean island of Mauritius in 1512, although he may not have been the first Portuguese explorer to do so; earlier expeditions by Diogo Dias and Afonso de Albuquerque along with Diogo Fernandes Pereira may have encountered the islands. In 1528 explorer Diogo Rodrigues (after whom the island of Rodrigues is named) named the islands of Réunion, Mauritius, and Rodrigues the Mascarene Islands, after Mascarenhas. [END] 
[1]  [DOC] Diego Garcia is an atoll just south of the equator in the central Indian Ocean, and the largest of 60 small islands comprising the Chagos Archipelago. It was settled by the French in the 1790s and was transferred to British rule after the Napoleonic Wars. It was one of the "Dependencies" of the British Colony of Mauritius until it was detached for inclusion in the newly created British Indian Ocean Territory (BIOT) in 1965. Between 1968 and 1973, the population was forcibly removed by the United Kingdom and the United States (in order to establish an American base) through intimidation of locals and denying the return of any who left the island. Many were deported to Mauritius and Seychelles, following which the United States built a large naval and military base on Diego Garcia, which has been in continuous operation ever since. s of 2015 , Diego Garcia is the only inhabited island of the BIOT; the population is composed of military personnel and supporting contractors. [END] 
Answer: 
Chagos Archipelago
Chagos Archipelago