To which country does the island of Saaremaa belong?

Saaremaa is the largest island in Estonia, measuring 2,673 km2 (1,032 sq mi). The main island of Saare County, it is located in the Baltic Sea, south of Hiiumaa island and west of Muhu island, and belongs to the West Estonian Archipelago. The island is called Saaremaa in Estonian, and in Finnish Saarenmaa—literally "isle land" or "island land".