Agin-Buryat Okrug (Russian: Аги́нский-Буря́тский о́круг; Buryat: Агын Буряадай тойрог Agyn Burjaadaj toirog), or Aga Buryatia, is an administrative division of Zabaykalsky Krai, Russia. It was a federal subject of Russia (an autonomous okrug of Chita Oblast) until it merged with Chita Oblast to form Zabaykalsky Krai on March 1, 2008. Prior to merger, it was called Agin-Buryat Autonomous Okrug (Аги́нский-Буря́тский автоно́мный о́круг). Its administrative center is the urban-type settlement of Aginskoye. Area: 19,312.3 square kilometers (7,456.5 sq mi). Population: 77,179 (2010 Census preliminary results); 72,213 (2002 Census); 77,032 (1989 Census).