birch forest of biebrza river bird wildlife reserve during spring nesting period aside carska droga in poland

air attraction bagna bagno biebrza biebrzanski bio birch birding blue carska country countryside droga eco education europe forest goniadz grass landmark lawka masuria mazury meadow moor narodowy national nature open outdoor panorama panoramic park podlaskie poland reserve river route sightseeing spring swamp thicket tourism touristic travel tree trekking valley viewing village warmia water wetland wildlife wood