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 forestsŹródło: https://en.wikipedia.org/wiki/Masuria#Landscape
Something about cultureThe culture of Poland is closely connected with its intricate thousand-year history.1 Its unique character developed as a result of its geography at the confluence of various European regions.
With origins in the culture of the Early Slavs, over time Polish culture has been profoundly influenced by its interweaving ties with the Germanic, Latinate and Byzantine worlds as well as in continual dialog with the many other ethnic groups and minorities living in Poland.2 The people of Poland have traditionally been seen as hospitable to artists from abroad and eager to follow cultural and artistic trends popular in other countries.
In the 19th and 20th centuries the Polish focus on cultural advancement often took precedence over political and economic activity.
These factors have contributed to the versatile nature of Polish art, with all its complex nuances.2 Nowadays, Poland is a highly developed country that retains its tradition.Źródło: https://en.wikipedia.org/wiki/Culture_of_Poland
You can also visit the other, less frequented by tourists around, such as the Bieszczady Gorce.