Mongkol Borei River

The Mongkol Borei River is a river in Mongkol Borei District in Banteay Meanchey Province in western Cambodia. It flows from the border of Prachin Buri province in Thailand and runs through Mongkol Borei and neighbouring districts. It is a major tributary of the Tonlé Sap.

The Khmer Rouge destroyed a bridge which once crossed the river.