Lower course
Confluence with the Supraśl
The Biała is an approx. 35 km long tributary of the Supraśl in the northeast Poland in the voivodeship Podlaskie. It is very popular with canoeists and anglers.
Run
The Biała rises in the Knyszyn Heath at Zabłudów and flows westwards to the Supraśl, where it follows Białystok flows out.