Chak SarChak Sar is a village in Chaybagh Rural District of Narenjestan District in North Savadkuh County, Mazandaran province, Iran.DemographicsPopulationAt the time of the 2006 National Census, the village's population was 332 in 77 households, when it was in Sharq va Gharb-e Shirgah Rural District of the former Shirgah District in Savadkuh County. The following census in 2011 counted 355 people in 101 households. The 2016 census measured the population of the village as 273 people in 100 households, by which time the district had been separated from the county in the establishment of North Savadkuh County. The rural district was transferred to the new Central District, and Chak Sar was transferred to Chaybagh Rural District created in the new Narenjestan District.