Śniardwy () is a

lake A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from ...

in the

Masurian Lake District The Masurian Lake District or Masurian Lake Land () is a lake district in northeastern Poland Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpath ...

of the Warmian-Masurian Voivodeship,

Poland Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, bordered by Lithuania and Russia to the northeast, Belarus and Ukrai ...

. At , Śniardwy is the largest lake in Poland. It was also the largest lake in

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

and in Germany, when Warmia-Masuria was under German rule and formed the southern part of

East Prussia East Prussia was a Provinces of Prussia, province of the Kingdom of Prussia from 1772 to 1829 and again from 1878 (with the Kingdom itself being part of the German Empire from 1871); following World War I it formed part of the Weimar Republic's ...

. It is long and wide. The maximum depth is 23 metres (75 feet). There are eight islands on the Śniardwy lake.Lake Śniardwy at the International Lake Environment Committee webpage
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Geography

Śniardwy was formed by retreating ice sheet and draining floodwaters occurring as the result of ice calving ahead of the receding

glacier A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires ...

. Among the eight islands are: Szeroki Ostrów, Czarci Ostrów, Wyspa Pajęcza, Wyspa Kaczor and others. Surrounding settlements include Popielno, Głodowo, Niedźwiedzi Róg, Okartowo, Nowe Guty, Zdęgowo and Łuknajno. Among the many

inlet An inlet is a typically long and narrow indentation of a shoreline such as a small arm, cove, bay, sound, fjord, lagoon or marsh, that leads to an enclosed larger body of water such as a lake, estuary, gulf or marginal sea. Overview In ...

s, two are named as separate lakes: Warnołty and Seksty. Śniardwy connects with the following lakes: Tuchlin, Łuknajno, Mikołajskie, Roś, Białoławki and Tyrkło. It is surrounded by the system of

canal Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface ...

s known as Kanały Mazurskie (Masurian Canals), with numerous sluices. Together, they form the Polish Masurian Lake District. It is one of the few reservoirs that has 2 surface outflows: Jeglin Canal, leading to Lake Roś, and the Wyszka River, flowing into Lake Białoławki. Both watercourses have a regulated flow (lock, weir).

Bibliography

* J. Szynkowski, ''Mazury. Przewodnik'', Kengraf

Kętrzyn Kętrzyn (, until 1946 ''Rastembork''; ) is a town in northeastern Poland with 27,478 inhabitants (2019). It is the capital of Kętrzyn County in the Warmian–Masurian Voivodeship. The town is known for the surrounding Masurian Lakeland and num ...

, 2003 Lakes of Warmian-Masurian Voivodeship {{Mrągowo-geo-stub