This structure ranks first in importance amongst the other castles in Mazandaran province. It was utilized even in the early Safavid era, and was then one of the seats of local power.

Mazandaran (Khazar) Sea or the Caspian Sea is to the north, the provinces of Tehran and Semnan lie towards the south.

The Kheir Abad complex is one of the most important historical sites in Gachsaran. This complex consists of a school, fire temple, castles, and water reservoirs.

The construction of these types of castles are related to the sun worshipping and angel fertility beliefs.

This relic is located on the right side of the Dehdasht - Behbahan Road, and to the left of the Kheir Abad River and is related to the Sassanide era.