The Zahak Castle is located in Hashtrud, within Iran’s East Azerbaijan Province. The name Zahak or Zahhak is derived from ancient Iranian mythology (possibly from Azhi Dahak).
The Zahak castle in Azarbaijan province in northwest Iran. Note pattern of brick works, archways and stairway. The origins of the site has been dated as far back as 2000 BCE, during the reign of the Parthian dynasty (c. 250 BCE-224 CE) (Photo sources: Images forwarded to Kavehfarrokh.com by Ms. Tara Farhid-Gallo in the article –گردایه (مجموعه) باستانی آژدهاک ( ضحاک ) آذرآبادگان– and in Darvakeran Blogspot).
Experts share a general consensus that this region was inhabited from the second millennium BCE until the Timurid era (1370-1507).