From the Wikipedia page [1]
Ust-Orda Buryat Autonomous Okrug (Russian: Усть-Орды́нский Буря́тский автоно́мный о́круг (УОБАО); Buryat: Усть-Ордын (Усть-Ордагай) Буряадай автономито тойрог) was an autonomous okrug of Russia within Irkutsk Oblast. The territory is now administrated as Ust-Orda Buryat Okrug of the same oblast.