case_images: PMC9124856_01
case_images: Aerial photograph of Kashan region around 1937.
case_images: fpubh-10-882943-g0002.jpg
case_images: PMC9124856_01_fpubh-10-882943-g0002.jpg
case_images: F2
case_images: One of the oldest qanat-based civilizations in central Iran as shown in Figure 2 is the 7,500-year-old Silk civilization, the remains of which are located in Kashan and near the Fin qanat (Sulaymaniyah spring), and research shows that the Fin qanat is the result of turning the spring into the qanat has been used by the inhabitants of this region throughout history, and of course the conversion of a spring into an qanat is one of the hypotheses about the emergence of the first qanats.