Query: What is its largest island?
Context: It had a population of 2,765,940 in 2013 and has a total area of 29,574 km2 (11,419 sq mi). Galicia has over 1,660 km (1,030 mi) of coastline, including its offshore islands and islets, among them Cíes Islands, Ons, Sálvora, Cortegada, and—the largest and most populated—A Illa de Arousa.