Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Village in Gilan province, Iran
For other places with a similar name, see Qarah Su.
At the time of the 2006 National Census, the village's population was 1,524 in 351 households. The following census in 2011 counted 1,882 people in 501 households. The 2016 census measured the population of the village as 1,537 people in 468 households. It was the most populous village in its rural district.
Qarah Suy can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "-3771192" in the "Unique Feature Id" form, and clicking on "Search Database".