Na’in lies 170 km north of Yazd and 140 km east of Isfahan and the population is about 75,000.
With an area of almost 35,000 km², Na’in lies at an altitude of 1545 m above sea level. Like much of the Iranian plateau, it has a desert climate, with a maximum temperature of about 41°C in summer, and minimums of -9°C or so in winter.
More than 3,000 years ago the Persians learned how to construct aqueducts underground (qanat or kariz) to bring water from the mountains to the plains. In the 1960s this ancient system provided more than 70 per cent of the water used in Iran and Na’in is one of the best places in all the world to see these qanats working as they were intended.
Unique to Na’in are some of the most outstanding monuments in all of Iran: the Jame Mosque, one of the first four mosques built in Iran after the Arab invasion; the Pre-Islamic Narej Fortress; a Pirnia traditional house; the Old Bazaar; Rigareh, a qanat-based watermill; and a Zurkhaneh (a place for traditional sport).
Besides its magnificent monuments, Na’in is also famous for high-quality carpets and wool textiles.
Some linguists believe the word Na’in may have been derived from the name of one of the descendants of the prophet Noah, who was called "Naen". Many local people speak an ancient Pahlavi Sasani dialect, the same
dialect that is spoken by the Zoroastrians in Yazd today. Other linguists state that the word Na’in is derived from the word "Nei" (“straw” in English) which is a marshy plant.