The document discusses some of the most interesting places to visit in Poland, including the Tatra Mountains, Mazury region, Białowieża Forest, and Słowiński National Park. The Tatra Mountains are the highest mountain range in Poland and form the border with Slovakia. Mazury is known for its 2,000 lakes and occupies much of the Masurian Lake District. Białowieża Forest is famous for having the oldest forests in Europe and contains a biosphere reserve. Słowiński National Park is located on the Baltic coast and contains sand dunes that were formerly part of a bay that has been separated from the sea by moving sand dunes.