Zeus open air altar is located on Dedetepe, just west of Adatepe Village, Küçükkuyu, in Ayvacık District. A platform was formed by flattening the bedrock on the hill. On this platform, three sides of the bedrock are carved. There is a cistern in the center and it was probably built as a votive well when it was made and was later converted into a cistern.
Although some researchers have described this altar as kaynak the altar of Zeus us, such information does not take place in ancient sources. But in Homer’s Ilyada, the Gargaros Hill at the summit of Zeus, in the Idaada, has a palace and altar.