Nain (Persian: نایین or نائين‎‎, also Romanized as Nā’īn, Nāeyn, and Nain) is a city in and the capital of Nain County, Isfahan Province, Iran. At the 2006 census, its population was 24,424, in 6,950 families.Na’in (also known as Naein and Naeen) lies 170 km north of Yazd and 140 km east of Esfahan with an area of almost 35,000 km², Na’in lies at an altitude of 1545 m above sea level.