Tsagan-Usun (; , Sagaan uhan) is a rural locality (a selo) in Dzhidinsky District, Republic of Buryatia, Russia. The population was 276 as of 2010.Всероссийские переписи населения 2002 и 2010 годов There are 6 streets.
Geography Tsagan-Usun is located 74 km southeast of Petropavlovka (the district's administrative centre) by road. Naushki is the nearest rural locality.Расстояние от Цагана-Усуна до Петропавловки
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