The Tajik language (a variety of Persian) is widespread in the cities of Bukhara and Samarkand because of their relatively large population of ethnic Tajiks. It is also found in large pockets in Kasansay, Chust, Rishtan and Sokh in Ferghana Valley, as well as in Burchmulla, Ahangaran, Baghistan in the middle Syr Darya district, and finally in, Shahrisabz, Qarshi, Kitab and the river valleys of Kafiringan and Chaganian, forming altogether, approximately 10–15% of the population of Uzbekistan.