Qarah Sangi () is a village in Pol Khatun Rural District of Marzdaran District in Sarakhs County, Razavi Khorasan province, Iran.
The village is located 95 km south of the city of Sarakhs and at the confluence of the Hari and Kashf Rivers on the IranâÂÂTurkmenistan border. Its altitude is 400 meters above sea level and its climate is hot and dry mountainous.
At the time of the 2006 National Census, the village's population was 713 in 134 households. The following census in 2011 counted 546 people in 134 households. The 2016 census measured the population of the village as 919 people in 231 households.