0424 GMT October 22, 2021
The figure includes civilians and combatants and is based on strict methodology requiring the full name of the deceased, as well as an established date and location of death, Reuters reported.
"On this basis, we have compiled a list of 350,209 identified individuals killed in the conflict in Syria between March 2011 to March 2021," U.N. High Commissioner for Human Rights Michelle Bachelet told the Human Rights Council.
One in every 13 victims was a woman or a child, she said.
"It indicates a minimum verifiable number, and is certainly an undercount of the actual number of killings," she added.
Her office was working on a statistical model to provide a more complete picture, which could also help establish accountability for some killings, she said.
The largest number of documented killings, 51,731, was recorded in Aleppo governorate which became a flashpoint in the conflict.
The foreign-backed war sparked the world's biggest refugee crisis. Syria's neighbours host 5.6 million refugees, while European countries are hosting more than one million.