page_title: Poland
section_title: Waters
hierarchical_section_title: Poland / Geography / Waters
context_page_description: Poland, officially the Republic of Poland, is a country located in Central Europe. It is divided into 16 administrative subdivisions, covering an area of 312,696 square kilometres, and has a largely temperate seasonal climate. With a population of nearly 38.5 million people, Poland is the fifth most populous member state of the European Union. Poland's capital and largest metropolis is Warsaw. Other major cities include Kraków, Łódź, Wrocław, Poznań, Gdańsk, and Szczecin.
  Poland is bordered by the Baltic Sea, Lithuania, and Russia's Kaliningrad Oblast to the north, Belarus and Ukraine to the east, Slovakia and the Czech Republic to the south, and Germany to the west.
  The history of human activity on Polish soil spans thousands of years. Throughout the late antiquity period it became extensively diverse, with various cultures and tribes settling on the vast Central European Plain. However, it was the Western Polans who dominated the region and gave Poland its name. The establishment of Polish statehood can be traced to 966, when the pagan ruler of a realm coextensive with the territory of present-day Poland embraced Christianity and converted to Catholicism.
context_section_description: The longest rivers are the Vistula (Polish: Wisła), 1,047 kilometres (651 mi) long; the Oder (Polish: Odra) which forms part of Poland's western border, 854 kilometres (531 mi) long; its tributary, the Warta, 808 kilometres (502 mi) long; and the Bug, a tributary of the Vistula, 772 kilometres (480 mi) long. The Vistula and the Oder flow into the Baltic Sea, as do numerous smaller rivers in Pomerania.
  The Łyna and the Angrapa flow by way of the Pregolya to the Baltic Sea, and the Czarna Hańcza flows into the Baltic Sea through the Neman. While the great majority of Poland's rivers drain into the Baltic Sea, Poland's Beskids are the source of some of the upper tributaries of the Orava, which flows via the Váh and the Danube to the Black Sea. The eastern Beskids are also the source of some streams that drain through the Dniester to the Black Sea.
  Poland's rivers have been used since early times for navigation. The Vikings, for example, travelled up the Vistula and the Oder in their longships. In the Middle Ages and in early modern times, when the Polish–Lithuanian Commonwealth was the breadbasket of Europe; the shipment of grain and other agricultural products down the Vistula toward Gdańsk and onward to other parts of Europe took on great importance.
  In the valley of Pilica river in Tomaszów Mazowiecki there is a unique natural karst spring of water containing calcium salts, that is an object of protection in Niebieskie Źródła Nature Reserve in Sulejów Landscape Park. The origin of the name of the reserve Niebieskie Źródła, that means Blue Springs, comes from the fact that red waves are absorbed by water and only blue and green are reflected from the bottom of the spring, giving that atypical colour.
  With almost ten thousand closed bodies of water covering more than 1 hectare (2.47 acres) each, Poland has one of the highest numbers of lakes in the world. In Europe, only Finland has a greater density of lakes. The largest lakes, covering more than 100 square kilometres (39 sq mi), are Lake Śniardwy and Lake Mamry in Masuria, and Lake Łebsko and Lake Drawsko in Pomerania.
  In addition to the lake districts in the north (in Masuria, Pomerania, Kashubia, Lubuskie, and Greater Poland), there are also many mountain lakes in the Tatras, of which the Morskie Oko is the largest in area. The lake with the greatest depth—of more than 100 metres (328 ft)—is Lake Hańcza in the Wigry Lake District, east of Masuria in Podlaskie Voivodeship.
  Among the first lakes whose shores were settled are those in the Greater Polish Lake District. The stilt house settlement of Biskupin, occupied by more than one thousand residents, was founded before the 7th century BC by people of the Lusatian culture.
  Lakes have always played an important role in Polish history and continue to be of great importance to today's modern Polish society. The ancestors of today's Poles, the Polanie, built their first fortresses on islands in these lakes. The legendary Prince Popiel ruled from Kruszwica tower erected on the Lake Gopło. The first historically documented ruler of Poland, Duke Mieszko I, had his palace on an island in the Warta River in Poznań. Nowadays the Polish lakes provide a location for the pursuit of water sports such as yachting and wind-surfing.
  The Polish Baltic coast is approximately 528 kilometres (328 mi) long and extends from Świnoujście on the islands of Usedom and Wolin in the west to Krynica Morska on the Vistula Spit in the east. For the most part, Poland has a smooth coastline, which has been shaped by the continual movement of sand by currents and winds. This continual erosion and deposition has formed cliffs, dunes, and spits, many of which have migrated landwards to close off former lagoons, such as Łebsko Lake in Słowiński National Park.
  The largest spits are Hel Peninsula and the Vistula Spit. The coast line is varied also by Szczecin and Vistula Lagoons and a few lakes, e.g. Łebsko and Jamno. The largest Polish Baltic island is called Wolin known for its Wolin National Park. The largest sea harbours are Szczecin, Świnoujście, Gdańsk, 
caption: The Polish Baltic Sea coast is approximately 528 kilometres (328 mi) long and extends from Usedom island in the west to Krynica Morska in the east.
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