Irbe Strait, also known as Irben Strait , forms the main exit out of the Gulf of Riga

Gulf of Riga

The Gulf of Riga, or Bay of Riga, is a bay of the Baltic Sea between Latvia and Estonia. According to C.Michael Hogan, a saline stratification layer is found at a depth of approximately seventy metres....

 to the Baltic Sea

Baltic Sea

The Baltic Sea is a brackish mediterranean sea located in Northern Europe, from 53°N to 66°N latitude and from 20°E to 26°E longitude. It is bounded by the Scandinavian Peninsula, the mainland of Europe, and the Danish islands. It drains into the Kattegat by way of the Øresund, the Great Belt and...

, between the Sõrve Peninsula

Sõrve Peninsula

Sõrve Peninsula is a peninsula which forms the southernmost section of the Estonian island Saaremaa. Its length is 32 km, and its maximum width 10 km...

 forming the southern end of the island Saaremaa

Saaremaa

Saaremaa is the largest island in Estonia, measuring 2,673 km². The main island of Saare County, it is located in the Baltic Sea, south of Hiiumaa island, and belongs to the West Estonian Archipelago...

 in Estonia

Estonia

Estonia , officially the Republic of Estonia , is a state in the Baltic region of Northern Europe. It is bordered to the north by the Gulf of Finland, to the west by the Baltic Sea, to the south by Latvia , and to the east by Lake Peipsi and the Russian Federation . Across the Baltic Sea lies...

 and Courland peninsula

Courland

Courland is one of the historical and cultural regions of Latvia. The regions of Semigallia and Selonia are sometimes considered as part of Courland.- Geography and climate :...

 in Latvia

Latvia

Latvia , officially the Republic of Latvia , is a country in the Baltic region of Northern Europe. It is bordered to the north by Estonia , to the south by Lithuania , to the east by the Russian Federation , to the southeast by Belarus and shares maritime borders to the west with Sweden...

. It is 27 km wide at its narrowest point. A shipping channel has been dredged along its southern shore to allow larger ships to pass.

More than 14,000 sea mines from World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 and World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

still lie in the strait.