- Origin: Amarkantak hills of the Maikal Range in Madhya Pradesh.
- Passing States: Madhya Pradesh, Uttar Pradesh, Jharkhand, and Bihar.
- Note: It is a principal southern tributary of the Ganges (Ganga) River after the Yamuna River.
- Tributaries: Major tributaries of the Son River are Banas, Gopad, Rihand, Kanhar, and North Koel.
- Geographical Setting: The valley is bordered by the Kaimur Range to the north and the Chota Nagpur Plateau to the south.
- Dispute: Disputed between Bihar and Jharkhand, which recently reached an agreement.
Source: The Hindu