Qarah Su () is a village in Shirvan-e Sharqi Rural District of Shirvan District in Borujerd County, Lorestan province, Iran.
Demographics Population At the time of the 2006 National Census, the village's population was 452 in 116 households, when it was in Shirvan Rural District of the Central District. The following census in 2011 counted 529 people in 137 households. The 2016 census measured the population of the village as 554 people in 149 households.
In 2021, the rural district was separated from the district in the formation of Shirvan District and renamed Shirvan-e Sharqi Rural District.
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