Wigierski National Park
The largest is the River Czarna Hańcza.
Peat bogs, small and marshy forest lakes are very characteristic of this park. Pine and spruce forests dominate, but there are also colonies of moor, aquatic and meadow plants.
Mammals living in the forest include elk, red deer, roe deer, wolf and beaver. There is a profusion of aquatic birds, and the park waterways teem with rare fish species such as powan, the European white-fish, and bulltrout.
The park is under the protection of the RAMSAR International Convention.