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Poland's territory extends across several geographical regions, between latitudes 49° and 55° N, and longitudes 14° and 25° E. In the north-west 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 centre 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 north-eastern 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 Kraków-Czestochowa Upland, the Swietokrzyskie Mountains, and the Carpathian Mountains, including the Beskids. The highest part of the Carpathians is the Tatra Mountains, along Poland's southern border.
The geological structure of Poland has been shaped by the continental collision of Europe and Africa over the past 60 million years, on the one hand (and the other), by the Quaternary glaciations of northern Europe. Both processes shaped the Sudetes and the Carpathian Mountains. The moraine landscape of northern Poland contains soils made up mostly of sand or loam, while the ice age river valleys of the south often contain loess. The Kraków-Czestochowa Upland, the Pieniny, and the Western Tatras consist of limestone, while the High Tatras, the Beskids, and the Karkonosze are made up mainly of granite and basalts. The Polish Jura Chain is one of the oldest mountain ranges on earth.
Poland has 70 mountains over 2,000 metres (6,600 ft) in elevation, all in the Tatras. The Polish Tatras, which consist of the High Tatras and the Western Tatras, is the highest mountain group of Poland and of the entire Carpathian range. In the High Tatras lies Poland's highest point, the north-western peak of Rysy, 2,499 metres (8,199 ft) in elevation. At its foot lies the mountain lakes of Czarny Staw pod Rysami (Black Lake below Mount Rysy), and Morskie Oko (the Marine Eye).
The second highest mountain group in Poland is the Beskids, whose highest peak is Babia Góra, at 1,725 metres (5,659 ft). The next highest mountain groups is the Karkonosze in the Sudetes, whose highest point is Sniezka, at 1,602 metres (5,256 ft); Snieznik Mountains whose highest point is Snieznik, at 1,425 metres (4,675 ft).
Tourists also frequent the Bieszczady Mountains in the far southeast of Poland, whose highest point in Poland is Tarnica, with an elevation of 1,346 metres (4,416 ft), Gorce Mountains in Gorce National Park, whose highest point is Turbacz, with elevations 1,310 metres (4,298 ft), and the Pieniny in Pieniny National Park, whose highest point is Wysokie Skalki (Wysoka), with elevations 1,050 metres (3,445 ft). The lowest point in Poland - at 2 metres (6.6 ft) below sea level - is at Raczki Elblaskie, near Elblag in the Vistula Delta.
The only desert located in Poland stretches over the Zaglebie Dabrowskie (the Coal Fields of Dabrowa) region. It is called the Bledów Desert, located in the Silesian Voivodeship in southern Poland. It has a total area of 32 square kilometres (12 sq mi). It is one of only five natural deserts in Europe. But also, it is the warmest desert that appears at this latitude. Bledów Desert was created thousands of years ago by a melting glacier. The specific geological structure has been of big importance. The average thickness of the sand layer is about 40 metres (131 ft), with a maximum of 70 metres (230 ft), which made the fast and deep drainage very easy.
The Baltic Sea activity in Slowinski National Park created sand dunes which in the course of time separated the bay from the sea. As waves and wind carry sand inland the dunes slowly move, at a speed of 3 to 10 metres (9.8 to 32.8 ft) meters per year. Some dunes are quite high - up to 30 metres (98 ft). The highest peak of the park - Rowokol (115 metres or 377 feet above sea level) - is also an excellent observation point.