Fasa (, also Romanized as Fassa) is a city and capital of Fasa County, Fars Province, Iran. At the 2016 census, its population was 110,825, in 33,379 families. Fasa is the fourth most populous city of the province. The city dates back to the Achaemenid period. Fasa's economy is based on agriculture and Pastoralism. Jahrom, Darab, Sarvestan, Kherameh and Estahban are neighbours of Fasa. This city is located on the road from Shiraz to Kerman, This has made Fasa a strategic and important city. Name The name Fasa is derived from the older form Pasā. Various etymologies for this name have been proposed. Local tradition holds that Fasa is named after a legendary prince named Pasa, son of Fars and grandson of Tahmuras. In Ibn al-Balkhi's retelling the legend, Fars granted the town of Fasa to Pasa; in Hamdallah Mustawfi's version, Pasa founds the city himself (in this version, he is directly the son of Tahmuras). Harold Bailey proposed on linguistic grounds that the name is ultimately derived from Old Persian *pa-sāya, meaning "campground". This name would have referred to what was originally a Persian nomadic encampment that later evolved into a town (presumably Tall-e Zahhak, 3km south of present-day Fasa). It would have then come to refer more generally to the entire surrounding plain – i.e. the Fasa plain. The Persepolis Administrative Archives (tablets 49 and 53) mention a place in Fars called (in Elamite) ba-a-ši-ya-an, which George Glenn Cameron had already identified with Fasa; Bailey argued that this is an Elamite rendering of the Persian name *Pasāya. This identification is not entirely uncontested – for example, Jan Tavernier reconstructs this form as Old Persian *Paišiyā-, literally meaning "before" and being a shortened form of a longer name. Tavernier instead prefers the form *Fasāta, reconstructed from Elamite Pa-iš-šá-taš, as the ancient name of Fasa. Researchers have also considered the meaning of the word Fasa "the city of the Persians". Much earlier, the 13th century writer Yaqut al-Hamawi also suggested that the name meant "the north wind". Whatever its original meaning was, the name of Fasa later became Pasā in Middle Persian. At some point the ancient site at Tall-e Zahhak was abandoned and the name was transferred to the modern site. Finally, after the Muslim conquest of Persia, since Arabic doesn't have the sound "P", Arabic authors wrote the name as Fasā or Basā. Eventually, the Arabized form Fasā