The present research is an investigation of different recordings of Kārīyān fire temple in Pahlavi sources and its adaptation with sources of historical geography in the Islamic era. This toponym, which is introduced as Kārīyān in the sources of the Islamic era, can be seen in various forms such as Kārnīkān and KanārnīkanIn in Pahlavi manuscripts. It is shown here that rendering this toponym as Kāriyān and attribute it to a region near Lār city is not satisfatory. And according to the documents mentioned in the current research, it can be seen that two recent renderings of this toponym in the Pahlavi texts (as Kārnīkān and Kanārnīkan) are more related to a fire temple in Shiraz called Kārnīyān, which is mentioned by Istakhri. In addition to Istakhry's Masālik wa Mamālik, other sources such as Ibn Hawqal's Sūrat al-'Ard have mentioned this toponym. Therefore, the possibility that the name of this fire temple is different from the famous Persian rendering is strengthened. It should also be mentioned that the recording of this word in the Iranian version of Bundahišn, known as TD1, as Kārnīkān, is more authentic and has an older construction. This research is based on documentary and library studies and tries to present its documentation in a comparative method.