Shahr-e Zow (; formerly,
Zavini-ye Pa'in , also
Romanized as
Zavini-ye Pa’in and
Zavin-e Pa’in, also known as
Zoo Sofla,
Zow-e Pa’in,
Zao Pain,
Zow Sofla, and
Zu-ye Soflá) is a city in and the capital of
Zavin District, in
Kalat County,
Razavi Khorasan Province,
Iran. At the 2006 census, its population was 4,053, in 959 families.