Saaremaa(redirected from Osilia)
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Saa·re·maaalso Sa·re·ma (sär′ə-mä′)
An island of western Estonia in the Baltic Sea at the mouth of the Gulf of Riga. Long strategically important, it has been controlled by the Teutonic Knights and by Livonia, Denmark, Sweden, Russia, and Estonia.
an island in the Baltic, at the mouth of the Gulf of Riga, belonging to Estonia. 1048 sq. mi. (2714 sq. km).