➤ It originates from Maikal range of Amarkantak hills in Madhya Pradesh near source region of Narmada. In ancient times, it was also known as ‘Sonbhadra’ and ‘Hiranyawah’.
➤ In last 2500 years, its course has shifted towards West. It is the longest South tributary of Ganga in Bihar.
➤ The Son river with 780 km length is one of the largest rivers of India out of which it flows only 202 km in Bihar.
➤ It enters Bihar in Rohtas district and also flows through Madhya Pradesh, Uttar Pradesh and Jharkhand states before entering into Bihar.
➤ It flows through Rift valley and forms boundaries of Palamu district of Jharkhand and Rohtas, Aurangabad, Bhojpur and Patna districts of Bihar.
➤ It finally meets with Ganga river near Danapur in Patna.
➤ Son river has a steep gradient with quick run-off and ephemeral regimes.
➤ Its main tributaries are Rihand, North Koel, Gopad and Kanhar.
➤ It divides the Kaimur hills and North Koel river valley which is located in South.
➤ Arrah, Dehri and Sonbhadra are the major cities situated at the bank of Son river.