The Biebrza is a river located in northeastern Poland, known for its unique wetlands and diverse ecosystems. It flows through the Biebrza National Park, which is one of the largest national parks in the country, covering over 59,000 hectares. The park is a vital habitat for many species of birds, making it a popular destination for birdwatching. The river is approximately 165 kilometers long and is characterized by its slow flow and meandering course. The surrounding area features marshes, peat bogs, and floodplains, which support a rich variety of flora and fauna. The Biebrza is also significant for its cultural heritage, with historical sites and traditional villages nearby.