2. Rudnia, Siemianowskie Lake
Siemanowskie Lake is an artificial basin and the third biggest lake of its kind in Poland. It was created in the second half of the 20th century as a damming reservoir for the waters of the Narew River, but in time, it became an attractive recreational destination. Today, it’s fitted with numerous attractions for visitors – bridges, observation towers, playing fields and water equipment rentals.