Ong River is a tributary of

Mahanadi river The Mahanadi is a major river in East Central India. It drains an area of around and has a total length of . Mahanadi is also known for the Hirakud Dam. The river flows through the states of Chhattisgarh and Odisha and finally merged with Bay o ...

. It flows across

Odisha Odisha (English: , ), formerly Orissa ( the official name until 2011), is an Indian state located in Eastern India. It is the 8th largest state by area, and the 11th largest by population. The state has the third largest population of ...

and joins Mahanadi upstream of Sonepur where Tel merges. The river rises at an elevation of and runs before it meets Mahanadi. It drains an area of about . Nearby rivers to Ong river: Tel Nadi ,

Gorkha Nadi The Gurkhas or Gorkhas (), with endonym Gorkhali ), are soldiers native to the Indian Subcontinent, chiefly residing within Nepal and some parts of Northeast India. The Gurkha units are composed of Nepalis and Indian Gorkhas and are recruit ...

, Subarnarekha River/Swarnarekha River ,

Godavari The Godavari ( IAST: ''Godāvarī'' �od̪aːʋəɾiː is India's second longest river after the Ganga river and drains into the third largest basin in India, covering about 10% of India's total geographical area. Its source is in Trimbakesh ...

, Manairu Vagu .Hydrology and Water Resources of India by Sharad K. Jain, Pushpendra K. Agarwal, Vijay P Singh
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References

Tributaries of the Mahanadi River Rivers of Odisha Rivers of India {{India-river-stub