Koo (; , Köö) is a rural locality (a selo) in Chelushmanskoye Rural Settlement of Ulagansky District, the Altai Republic, Russia. The population was 236 as of 2016. There are 5 streets. Geography Koo is located on the left bank of the Chulyshman River, 84 km north of Ulagan (the district's administrative centre) by road. Ethnicity The village is inhabited by Altai people-Telengits and others. References Rural localities in Ulagansky District