Irbe Strait, also known as Irben Strait (Estonian: Kura kurk, Latvian: Irbes jūras šaurums, Livonian: Sūr mer), forms the main exit out of the Gulf of Riga to the Baltic Sea, between the Sõrve Peninsula forming the southern end of the island Saaremaa in Estonia and Courland Peninsula in Latvia. It is 27 km wide at its narrowest point.