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Officially the Republic of Poland (Rzeczpospolita Polska), is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north. The total area of Poland is 312,679 square kilometers (120,726 sq mi), making it the 69th largest country in the world and the 9th largest in Europe. Poland has a population of over 38 million people, which makes it the 34th most populous country in the world and one of the most populous members of the European Union. The establishment of a Polish state is often identified with the adoption of Christianity by its ruler Mieszko I, in 966, when the state covered territory similar to that of present-day Poland. The Kingdom of Poland was formed in 1025, and in 1569 it cemented a long association with the Grand Duchy of Lithuania by signing the Union of Lublin, forming the Polish–Lithuanian Commonwealth. The commonwealth collapsed in 1795, and Poland's territory was partitioned among the Kingdom of Prussia, the Russian Empire, and Austria. Poland regained its independence as the Second Polish Republic in 1918, after World War I, but was later occupied by Nazi Germany and the Soviet Union during World War II. Poland lost over six million citizens in World War II, emerging several years later as the People's Republic of Poland within the Eastern Bloc under Soviet influence. During the Revolutions of 1989, communist rule was overthrown and Poland became what is constitutionally known as the "Third Polish Republic". Poland is a unitary state, made up of sixteen voivodeships (Polish: województwo). Poland is a member of the European Union, NATO, United Nations, World Trade Organization, and the Organisation for Economic Co-operation and Development (OECD). Poland’s territory extends across several geographical regions. In the northwest is the Baltic seacoast, which extends from the Bay of Pomerania to the Gulf of Gdansk. This coast is marked by several spits, coastal lakes (former bays that have been cut off from the sea), and dunes. The largely straight coastline is indented by the Szczecin Lagoon, the Bay of Puck, and the Vistula Lagoon. The center and parts of the north lie within the North European Plain. Rising gently above these lowlands is a geographical region comprising the four hilly districts of moraines and moraine-dammed lakes formed during and after the Pleistocene ice age. These lake districts are the Pomeranian Lake District, the Greater Polish Lake District, the Kashubian Lake District, and the Masurian Lake District. The Masurian Lake District is the largest of the four and covers much of northeastern Poland. The lake districts form part of the Baltic Ridge, a series of moraine belts along the southern shore of the Baltic Sea. South of the Northern European Lowlands lie the regions of Silesia and Masovia, which are marked by broad ice-age river valleys. Farther south lies the Polish mountain region, including the Sudetes, the Cracow-Częstochowa Upland, the Świętokrzyskie Mountains, and the Carpathian Mountains, including the Beskids. The highest part of the Carpathians is the Tatra Mountains, along Poland’s southern border. Flora and fauna A wisent in the Białowieża Forest Phytogeographically, Poland belongs to the Central European province of the Circumboreal Region within the Boreal Kingdom. According to the World Wide Fund for Nature, the territory of Poland can be subdivided into three ecoregions: the Baltic mixed forests, Central European mixed forests and Carpathian montane conifer forests. Many animals that have since died out in other parts of Europe still survive in Poland, such as the wisent in the ancient woodland of the Białowieża Forest and in Podlachia. Other such species include the brown bear in Białowieża, in the Tatras, and in the Beskids, the gray wolf and the Eurasian Lynx in various forests, the moose in northern Poland, and the beaver in Masuria, Pomerania, and Podlachia. Family of White Stork, a national bird in Poland In the forests, one also encounters game animals, such as Red Deer, Roe Deer and Wild Boars. In eastern Poland there are a number of ancient woodlands, like Białowieża, that have never been cleared by people. There are also large forested areas in the mountains, Masuria, Pomerania, Lubusz Land and Lower Silesia. Poland is the most important breeding ground for European migratory birds. Out of all of the migratory birds who come to Europe for the summer, one quarter breed in Poland, particularly in the lake districts and the wetlands along the Biebrza, the Narew, and the Warta, which are part of nature reserves or national parks.