Ganzak is an ancient Achaemenid

Achaemenid Empire

The Achaemenid Empire , sometimes known as First Persian Empire and/or Persian Empire, was founded in the 6th century BCE by Cyrus the Great who overthrew the Median confederation...

 town founded in northwestern Iran

Iran

Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

. Its name is originally Median

Medes

The MedesThe Medes...

 but later adopted into Persian

Persian language

Persian is an Iranian language within the Indo-Iranian branch of the Indo-European languages. It is primarily spoken in Iran, Afghanistan, Tajikistan and countries which historically came under Persian influence...

 (Old, and then New Persian). The city stood somewhere south of Lake Urmia

Lake Urmia

Lake Urmia , ancient name: Lake Matiene) is a salt lake in northwestern Iran, near Iran's border with Turkey. The lake is between the Iranian provinces of East Azerbaijan and West Azerbaijan, west of the southern portion of the similarly shaped Caspian Sea...

 and Atropates

Atropates

Atropates was a Persian nobleman who served Darius III, then Alexander III of Macedon, and eventually founded an independent kingdom and dynasty that was named after him...

 "presumably" chose the city as his capital.

The exact location, according to Minorsky, Schippmann, and Boyce, is identified as being near Laylān in the Miandoab

Miandoab

Miandoab is a city in and the capital of Miandoab County, West Azerbaijan Province, Iran. At the 2006 census, its population was 112,933, in 29,207 families....

 plain. The now-defunct identification of Ganzak with Takht-e Soleymān was caused by "defective Byzantine sources"

It was sacked by Heraclius

Heraclius

Heraclius was Byzantine Emperor from 610 to 641.He was responsible for introducing Greek as the empire's official language. His rise to power began in 608, when he and his father, Heraclius the Elder, the exarch of Africa, successfully led a revolt against the unpopular usurper Phocas.Heraclius'...

in 622 AD, and the fire temple and sanctuary of Adur Gushnasp was destroyed.