Biebrza

Biebrza is a river in north-eastern Poland, a tributary of the Narew River. It runs through the Podlaskie Voivodeship and forms a broad, low-lying floodplain known as the Biebrza Valley before joining the Narew.

The Biebrza Valley is one of Europe’s most extensive wetland landscapes, characterized by intermittent marshes, meadows, and peat bogs created by seasonal flooding. The valley supports a high diversity of plant and animal life and serves as an important stopover and wintering area for migratory birds.

Biebrza National Park, established in 1993, protects much of the valley's hydrology and habitats. The park encompasses marshes, peat mires, alder and willow forests, and extensive floodplains. It is a key site for birdwatching, wildlife observation, and nature research.

Human activity around the river is limited and traditional rural communities persist in the region. The area is popular for ecotourism, canoeing, hiking, and guided wildlife tours, with boat trips along wider reaches of the river.