Ust-Barguzin (Russian: Усть-Баргузи́н; Buryat: Баргажанай Адаг, Bargajanai Adag) is an urban locality (an urban-type settlement) in Barguzinsky District of the Republic of Buryatia, Russia, located on the shore of Lake Baikal at the mouth of the Barguzin River and 270 kilometers (170 mi) northeast of Ulan-Ude, the capital of the republic.

[2] It was founded in 1666 by a Cossack detachment under Gavril Lovzov.

[citation needed] Within the framework of administrative divisions, the urban-type settlement (inhabited locality) of Ust-Barguzin, together with eight rural localities, is incorporated within Barguzinsky District as Ust-Barguzin Urban-Type Settlement[1] (an administrative division of the district).

[10] As a municipal division, Ust-Barguzin Urban-Type Settlement is incorporated within Barguzinsky Municipal District as Ust-Barguzin Urban Settlement.

Precipitation is quite low and is significantly higher in summer than at other times of the year.