Birobidzhan, also spelt Birobijan, is a town and the administrative centre of the Jewish Autonomous Oblast, Russia, located on the Trans-Siberian Railway, near the China–Russia border. As of the 2010 Census, its population is 75,413, and its official language is Yiddish. Birobidzhan is named after the two largest rivers in the autonomous oblast: the Bira and the Bidzhan. The Bira, which lies to the east of the Bidzhan Valley, flows through the town. Both rivers are tributaries of the Amur.