Qarah Su, Razavi Khorasan

Qarah Su (, also Romanized as Qarah Sū and Qareh Sū; also known as Qara Sū) is a village in Kabud Gonbad Rural District, in the Central District of Kalat County, Razavi Khorasan Province, Iran. At the 2006 census, its population was 46, in 13 families.