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Semnan is a city in the Central District of Semnan County, Semnan province, Iran, serving as capital of the province, the county and the district. The city is on the alluvial fan of the Golrudbar creek in the north-central part of the country, 216 km east of Tehran and 640 km west of Mashhad. With a population of 185,129 people in 2016, Semnan is the most populous city in the province and the hub of the Semnani language, a sub-branch of the Iranian languages spoken to the north. It is home to the Semnani ethnic group.