Miandoab (Persian: مياندوآب) or Qushachay (Azerbaijani: Qoşaçay - قوشاچای) is a city and capital of Miandoab County, West Azerbaijan Province, Iran. At the 2012 census, its population was 135,880, in 38,704 families.
Miandoab, as its name suggests, is situated in a delta region of the two rivers Zarrineh-Rud and Simineh-Rud. Miandoab enjoys very fertile soil and excellent Mediterranean climate. Due to the establishment of a sugar factory in the early 20th century, there has been large industrial activity compared to nearby towns.
The village of Miandoab is on the Zarriné-Rūd river and located in the center of the plain that slopes down to Lake Urmia. It is 1,314 metres (4,311 ft) above the sea level, at 46°6′E latitude and 36°58′N longitude.
The city is a transportation connection point between West Azerbaijan Province and East Azerbaijan Province. Thus, the city has been a transportation crossroads between the two large provinces, and has attracted political and economic interest from local and international governments.
The area of Miandoab County is 2694 square kilometers. Miandoab County is located between the Iranian counties of Bukan, Malekan, Mahabad, and Shahin Dezh.
The majority of Miandoab's inhabitants are Iranian Azerbaijanis and speak Azerbaijani. There is also a small minority of Yarsan in Miandoab and surrounding villages. Miandoab used to have a sizable Bahá'í population, but due to the religious persecution by the government of the Islamic Republic, most have migrated to other cities within Iran or overseas.