At the distance of 6 km of the road between Firoz Abad and shiraz, Girl Castle of Firoz Abad is located in the foothill of a mountain which overlooks at the road.
This castle which belongs to the Sassanid era is located at the threshold of Tang Ab valley and in a region that its earth slope has made a natural gate.
Actually the castle is located on the above of a plain in where we can observe the path of the valley's floor which ends to Firoz Abad. It is built by some materials such as rough stones, chalk mortar and ….
It had the observation and security aspects for the first Sassanid capital, Gor twon.