Chestak-e Sofla () is a village in Gheynab Rural District of the Central District in Sarbisheh County, South Khorasan province, Iran.
Demographics At the time of the 2006 National Census, the village's population was below the reporting threshold, when it was in Momenabad Rural District. The village did not appear in the following census of 2011. The 2016 census measured the population of the village as 26 people in four households, by which time it had been separated from the rural district in the formation of Gheynab Rural District.
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