Qashqadaryo Province , (old spelling Kashkadarya Province) is a viloyat (province) of Uzbekistan, located in the southern part of the country in the basin of the Qashqadaryo River and the western slopes of the Pamir Mountains. It borders with Tadjikistan,Turkmenistan, Samarqand Province, Buxoro Province and Surxondaryo Province.