Tosu (; , Xalbaakı) is a rural locality (a selo), the administrative centre of and one of two settlements, in addition to Starovatovo, in Khalbakinsky Rural Okrug of Vilyuysky District in the Sakha Republic, Russia. It is located from Vilyuysk, the administrative center of the district. Its population as of the 2010 Census was 665,Sakha Republic Territorial Branch of the Federal State Statistics Service. Results of the 2010 All-Russian Census. Численность населения по районам, городским и сельским населённым пунктам (Population Counts by Districts, Urban and Rural Inhabited Localities) of whom 325 were male and 340 female, down from 731 as recorded during the 2002 Census.Registry of the Administrative-Territorial Divisions of the Sakha Republic
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Sources Official website of the Sakha Republic. Registry of the Administrative-Territorial Divisions of the Sakha Republic. Vilyuysky District.