Bian Darreh () is a village in Buin Rural District of Nanur District in Baneh County, Kurdistan province, Iran.
Demographics Ethnicity The village is populated by Kurds.
Population At the time of the 2006 National Census, the village's population was 473 in 86 households. The following census in 2011 counted 408 people in 90 households. The 2016 census measured the population of the village as 433 people in 118 households.
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