Riz Ab, South Khorasan

Riz Ab (, also Romanized as Rīz Āb; also known as Rehzow, Rīz Āb Bālā, and Rizau) is a village in Baqeran Rural District, in the Central District of Birjand County, South Khorasan Province, Iran. At the 2006 census, its population was 111, in 37 families.