Veisiejis Lake is in the Lazdijai district of southern Lithuania, about southwest of Veisiejai city. The lake is narrow, like a river, with sharp, high shores. Veisiejis Lake has 13 islands with a total area of . The lake connects with Lake Niedus.
Around the lake are the villages of Paveisiejai, Navikai, Gerveliai, Sapiegià ¡kiai, Paveisininkai, Burbai, PalaÃÂionys, Purviniai, SubaÃÂiai, and Kalviai.
The Veisiejis lake had a surface area of until 1956, but after the construction of the KapÃÂiamiestis hydroelectric power station, Veisiejis joined with Nadorius and Uosis lakes.