The flow of arrivals – around 20,000 since Thursday, with many more en route – is drawing Iraq's Kurdish communities ever closer to the growing regional crisis.
Thousands of refugees stranded on the border are mainly women, children and the elderly, Save the Children said.
"This is an unprecedented influx of refugees, and the main concern is that so many of them are stuck out in the open air at the border or in emergency reception areas with limited, if any, access to basic services," Alan Paul, Save the Children's emergency team leader said.
