Lega is a river in Poland, a right tributary of the river Biebrza. It flows through a number of lakes on the border of the Warmian-Masurian and Podlaskie Voivodeships. Its source is near the village of Szarejki.
It passes through the and the Small Olecko Lake at Olecko, and flows into the lake east of Eà Âk. At the outlet of this lake its name changes in many mappings, but its course in the lake may be shown. It continues to the lake , which is connected with the lake , under the name Maà Âkià Â. It flows out of Rajgrodzkie at Rajgród, and continues under the name '. It passes through the lake and flows into the Biebrza near Goniàdz.