A large, swampy wetland of reedbeds, lakes, forests, and meadows. Birulis lake is very shallow and surrounded by reedbeds. Sterva lake is surrounded by bogs. This IBA was previously known as `Lakes Birulis and Styrvas' in the previous pan-European inventory (Grimmett and Jones 1989).
An important breeding site for Botaurus stellaris and Larus minutus. Breeding species of global conservation concern that do not meet IBA criteria: Crex crex (a few calling males).
BirdLife International (2019) Important Bird Areas factsheet: Birzulius-Stervas marshes complex. Downloaded from http://www.birdlife.org on 24/06/2019.