The Curonian Lagoon (or Bay, Gulf;

Prussian Prussia (; ; Old Prussian: ''Prūsija'') was a German state centred on the North European Plain that originated from the 1525 secularization of the Prussian part of the State of the Teutonic Order. For centuries, the House of Hohenzoll ...

: ''Kursjanmari'', , ) is a

freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include non-salty mi ...

lagoon A lagoon is a shallow body of water separated from a larger body of water by a narrow landform, such as reefs, barrier islands, barrier peninsulas, or isthmuses. Lagoons are commonly divided into ''coastal lagoons'' (or ''barrier lagoons'') an ...

separated from the

Baltic Sea The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by the countries of Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden, and the North European Plain, North and Central European Plain regions. It is the ...

by the Curonian Spit. Its surface area is . The

Neman River Neman, Nemunas or Niemen is a river in Europe that rises in central Belarus and flows through Lithuania then forms Lithuania–Russia border, the northern border of Kaliningrad Oblast, Russia's western exclave, which specifically follows its s ...

() supplies about 90% of its inflows; its watershed consists of about 100,450 square kilometres in

Lithuania Lithuania, officially the Republic of Lithuania, is a country in the Baltic region of Europe. It is one of three Baltic states and lies on the eastern shore of the Baltic Sea, bordered by Latvia to the north, Belarus to the east and south, P ...

and Russia's

Kaliningrad Oblast Kaliningrad Oblast () is the westernmost federal subjects of Russia, federal subject of the Russian Federation. It is a Enclave and exclave, semi-exclave on the Baltic Sea within the Baltic region of Prussia (region), Prussia, surrounded by Pola ...

Human history

In the

13th century The 13th century was the century which lasted from January 1, 1201 (represented by the Roman numerals MCCI) through December 31, 1300 (MCCC) in accordance with the Julian calendar. The Mongol Empire was founded by Genghis Khan, which stretched ...

, the area around the lagoon was part of the ancestral lands of the

Curonians :''The Kursenieki are also sometimes known as Curonians.'' The Curonians or Kurs (; ) were a medieval Balts, Baltic tribe living on the shores of the Baltic Sea in the 5th–16th centuries, in what are now western parts of Latvia and Lithuania. ...

and

Old Prussians Old Prussians, Baltic Prussians or simply Prussians were a Balts, Baltic people that inhabited the Prussia (region), region of Prussia, on the southeastern shore of the Baltic Sea between the Vistula Lagoon to the west and the Curonian Lagoon ...

. Later it bordered the historical region of

Lithuania Minor Lithuania Minor (; ; ) or Prussian Lithuania (; ; ) is one of five ethnographic regions of Lithuania. It is a historical region of Prussia, where Prussian Lithuanians (or Lietuvininkai) lived, now located in Lithuania and the Kaliningrad Obla ...

. At the northern end of the Spit, the Klaipėda Strait connects the lagoon to the

, and the place was chosen by the

Teutonic Knights The Teutonic Order is a Catholic religious institution founded as a military society in Acre, Kingdom of Jerusalem. The Order of Brothers of the German House of Saint Mary in Jerusalem was formed to aid Christians on their pilgrimages to t ...

in 1252 to found Memelburg Castle and the city of

Klaipėda Klaipėda ( ; ) is a city in Lithuania on the Baltic Sea coast. It is the List of cities in Lithuania, third-largest city in Lithuania, the List of cities in the Baltic states by population, fifth-largest city in the Baltic States, and the capi ...

. In 1454, King

Casimir IV Jagiellon Casimir IV (Casimir Andrew Jagiellon; ; Lithuanian: ; 30 November 1427 – 7 June 1492) was Grand Duke of Lithuania from 1440 and King of Poland from 1447 until his death in 1492. He was one of the most active Polish-Lithuanian rulers; under ...

incorporated the region to the

Kingdom of Poland The Kingdom of Poland (; Latin: ''Regnum Poloniae'') was a monarchy in Central Europe during the Middle Ages, medieval period from 1025 until 1385. Background The West Slavs, West Slavic tribe of Polans (western), Polans who lived in what i ...

upon the request of the anti-Teutonic

Prussian Confederation The Prussian Confederation (, ) was an organization formed on 21 February 1440 at Marienwerder (present-day Kwidzyn) by a group of 53 nobles and clergy and 19 cities in Prussia, to oppose the arbitrariness of the Teutonic Knights. It was based o ...

. Following the peace treaty of 1466, the lagoon became a part of Poland as a

fief A fief (; ) was a central element in medieval contracts based on feudal law. It consisted of a form of property holding or other rights granted by an overlord to a vassal, who held it in fealty or "in fee" in return for a form of feudal alle ...

held by the Teutonic Knights,Górski, pp. 96–97, 214–215 and thus located within the

Polish–Lithuanian union Polish–Lithuanian can refer to: * Polish–Lithuanian union (1385–1569) * Polish–Lithuanian Commonwealth (1569–1795) * Polish-Lithuanian identity as used to describe groups, families, or individuals with histories in the Polish–Lithuania ...

, later elevated to the

Polish–Lithuanian Commonwealth The Polish–Lithuanian Commonwealth, also referred to as Poland–Lithuania or the First Polish Republic (), was a federation, federative real union between the Crown of the Kingdom of Poland, Kingdom of Poland and the Grand Duchy of Lithuania ...

. From the 18th century, it formed part of the

Kingdom of Prussia The Kingdom of Prussia (, ) was a German state that existed from 1701 to 1918.Marriott, J. A. R., and Charles Grant Robertson. ''The Evolution of Prussia, the Making of an Empire''. Rev. ed. Oxford: Clarendon Press, 1946. It played a signif ...

, and from 1871 also

Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...

. After 1923, the

Klaipėda Region The Klaipėda Region () or Memel Territory ( or ''Memelgebiet'') was defined by the 1919 Treaty of Versailles in 1920 and refers to the northernmost part of the German province of East Prussia, when, as Memelland, it was put under the administr ...

in the north passed to Lithuania (occupied by Germany in 1939–45), whereas the remainder fell to the

Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...

following

World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

. As the new

interwar In the history of the 20th century, the interwar period, also known as the interbellum (), lasted from 11 November 1918 to 1 September 1939 (20 years, 9 months, 21 days) – from the end of World War I (WWI) to the beginning of World War II ( ...

border, the river that flows into the Curonian Lagoon near

Rusnė Rusnė () is a border town in Šilutė district, Lithuania, located on the Rusnė Island in the Nemunas Delta, 9 km south-west from Šilutė. History Rusnė was first mentioned in historical sources in the 14th century. In 1419 the first c ...

was chosen. The river's lower 120 km in Germany were called ''die Memel'' by Germans, while the upper part located in Lithuania was known as Nemunas River. The border also separated the peninsula near the small holiday resort of

Nida, Lithuania Nida (, Kursenieki language, Kursenieki: ''Nīde'') is a resort town in Lithuania, the administrative centre of Neringa municipality. Located on the Curonian Spit between the Curonian Lagoon and the Baltic Sea, it is the westernmost point of Lit ...

. From 1939 to 1945, the Lithuanian part was occupied by Germany, and the southern part of the Spit and the Lagoon remained in Germany until 1945. This border is now the border between Lithuania and Russia, as after World War II, the southern end of the Spit and the German area south of the river became part an

exclave An enclave is a territory that is entirely surrounded by the territory of only one other state or entity. An enclave can be an independent territory or part of a larger one. Enclaves may also exist within territorial waters. ''Enclave'' is s ...

of Russia called

. The nearly extinct ethnic group the

Kursenieki The Kursenieki (, – 'Curonians', , ) are a nearly extinct Baltic ethnic group living along the Curonian Spit. "Kuršiai" refers only to inhabitants of Lithuania and former East Prussia that speak a southwestern dialect of Latvian. Some auto ...

lived in the surrounding area.

Natural history and ecology

The Lagoon, formed about 7,000 years BCE, is a

. Water depths average . It is highly

biodiverse Biodiversity is the variability of life on Earth. It can be measured on various levels. There is for example genetic variability, species diversity, ecosystem diversity and phylogenetic diversity. Diversity is not distributed evenly on Earth ...

, although troubled by

water pollution Water pollution (or aquatic pollution) is the contamination of Body of water, water bodies, with a negative impact on their uses. It is usually a result of human activities. Water bodies include lakes, rivers, oceans, aquifers, reservoirs and ...

. The presence of

algal bloom An algal bloom or algae bloom is a rapid increase or accumulation in the population of algae in fresh water or marine water systems. It is often recognized by the discoloration in the water from the algae's pigments. The term ''algae'' encompass ...

s was confirmed in the 2000s.

References

External links

Kurische Nehrung
(German) {{Authority control Baltic Sea Lagoons of Russia Lagoons of Lithuania Bodies of water of Kaliningrad Oblast Geography of Klaipėda County Lithuania–Russia border

Human history

Natural history and ecology

See also

References

External links