Welcome in Masuria
Masuria and the Masurian Lake District are known in Polish as Kraina Tysiąca Jezior and in German as Land der Tausend Seen, meaning "land of a thousand lakes." These lakes were ground out of the land by glaciers during the Pleistocene ice age around 14,000 - 15,000 years ago, when ice covered northeastern Europe. From that period originates the horn of a reindeer found in the vicinity of Giżycko.96 By 10,000 BC this ice started to melt. Great geological changes took place and even in the last 500 years the maps showing the lagoons and peninsulas on the Baltic Sea have greatly altered in appearance. More than in other parts of northern Poland, such as from Pomerania (from the River Oder to the River Vistula), this continuous stretch of lakes is popular among tourists. The terrain is rather hilly, with connecting lakes, rivers and streams. Forests account for about 30% of the area.9798 The northern part of Masuria is covered mostly by the broadleaved forest, while the southern part is dominated by pine and mixed forests
Źródło: https://en.wikipedia.org/wiki/Masuria#Landscape
Basic facts about Sudetes
The range stretches from eastern Germany along the northern border of the Czech Republic to south-western Poland. The highest peak of the range is Sněžka (Polish: Śnieżka) in the Krkonoše (Polish: Karkonosze) mountains on the Czech Republic?Poland border, which is 1,603 metres (5,259 ft) in elevation. The current geomorphological unit in the Czech part of the mountain range is Krkonošsko-jesenická subprovincie ("Krkonoše-Jeseníky").
The Krkonoše Mountains (also called the Giant Mountains) have experienced growing tourism for winter sports during the past ten years. Their skiing resorts are becoming a budget alternative to the Alps
Źródło: https://en.wikipedia.org/wiki/Sudetes
Nature in Poland - what to see?
Poland is a region very attractive nature. In this respect, we find a lot of places that necessarily must see, even if we do not care too much about the natural aspects of the site. Worthy of note are certainly places like Tatry and Owl Mountains. The hilly places in Poland is indeed much, much more - should go well in the Holy Cross Mountains and Pieniny. In Poland we will also find areas where there is a completely different vegetation and animals. You can mention here for example, Roztocze National Park and around the seaside. The fact that in Poland there are many national parks are the best proof of how special this place is.