Heyran passes is one of the touristic attractions in the Astara - Ardabil which is located in northwest of Iran. It is between mountains covered with forests and a small river (Astara chay)addad to its attraction.It is the border between Iran and Azerbaijan Republic.. One of the attractions Heyran is often covered in fog. The main reason for this Mhalvdgy almost constant humidity of the Caspian Sea.