Ulan-Ude (; , Ulaan Üde) is the capital city of the Republic of Buryatia, Russia; it is located about southeast of Lake Baikal on the Uda River at its confluence with the Selenga. According to the 2010 Census, 404,426 people lived in Ulan-Ude; up from 359,391 recorded in the 2002 Census, making the city the third largest in eastern Siberia by population.