Ong River is a tributary of Mahanadi river. It flows across Odisha and joins Mahanadi 240km (150miles) upstream of Sonepur where Tel merges. The river rises at an elevation of 457m (1,499feet) and runs 204km (127miles) before it meets Mahanadi. It drains an area of about 5128km2.
Nearby rivers to Ong river: Tel Nadi 76km (47miles), Gorkha Nadi 171km (106miles), Subarnarekha River/Swarnarekha River 431km (268miles), Godavari 485km (301miles), Manairu Vagu 508km (316miles).[1]