Kaa-Khemsky District is an administrative and municipal district, one of the seventeen in the Tuva Republic, Russia. It is located in the center and east of the republic. The area of the district is 25,726.04 square kilometers (9,932.88 sq mi). Its administrative center is the rural locality of Saryg-Sep. Population: 12,279 (2010 Census); 13,071 ; 14,982 (1989 Soviet census). The population of Saryg-Sep accounts for 36.0% of the district's total population.