Days of deadly clashes between the US-backed, Kurdish-led Syrian Democratic Forces (SDF) and local fighters have rocked eastern Syria's Deir Ezzor province, threatening a fragile balance in the strategic area. The SDF spearheaded the offensive that defeated the ISIS group's self-declared “caliphate” in Syria in 2019. Arab-majority Deir Ezzor province, a resource-rich region which borders Iraq, is bisected by the Euphrates river and is home to dozens of local tribal communities, some of whose fighters joined the SDF in its battle against ISIS.