The land of Al-Gadhiryiah is belonging to the tribe of "Bani Assad", so it's called "Gadhiryiat Bani Assad".
This land is close to the holy city of Karbala. It is considered as one of the villages located in the outskirts of Kufa district. And it seems that this land was merged with the "Taff" land and gained a majesty and holiness from it.
Imam Muhammed al-Baqir (peace be upon him) has referred to this land as saying: (Visit our graves in Al-Gadhiryiah ), while Imam Jaafar al-Sadiq (peace be upon him) has awarded the land of Al-Gadhiryiah, a religious place, saying: "It is from the soil of the holy Jerusalem."
Source:
The Karbala's Comprehensive Civilizational Encyclopaedia, The Historical Section, The Karbala Center for Studies and Research Vol. 1.