Saaremaa (also called Ösel [ˈøːsel] ) is the largest and most populous island in Estonia. Measuring 2,673 km2 (1,032 sq mi), its population is 31,435. The main island of the West Estonian archipelago, it is located in the Baltic Sea, south of Hiiumaa island and northwest of the Gulf of Riga. The administrative centre of the island, and of the Saare County, is the town of Kuressaare, which in January 2018, had 13,276 inhabitants.