Teppe Hasanlu or Tappeh Hassanlu (Persian: تپه حسنلو) is an archeological site of an ancient city located in northwest Iran (in the province of West Azerbaijan), a short distance south of Lake Urmia. The nature of its destruction at the end of the 9th century BC essentially froze one layer of the city in time, providing researchers with extremely well preserved buildings, artifacts, and skeletal remains from the victims and enemy combatants of the attack.