INDIAN GEOGRAPHY

Detailed explanation-1: -Son River (Hindi: , also spelt Sone River) is a perennial river located in central India. It originates near Amarkantak Hill in Gaurela-Pendra-Marwahi district of Chhattisgarh and finally merges with the Ganges River near Patna in Bihar.

Detailed explanation-2: -Gandak: Through the districts of West Champaran, Gopalganj, Saran, and Muzaffarpur, the Gandak flows 300 kilometres southeast across the Gangetic plain of Bihar state. Downstream of Hajipur, that is near patna it joins the Ganges at Sonpur.

Detailed explanation-3: -Son River, Son also spelled Sone, principal southern tributary of the Ganges (Ganga) River, rising in Madhya Pradesh state, central India. It flows north past Manpur and then turns northeast. The river cuts through the Kaimur Range and joins the Ganges above Patna, after a 487-mile (784-km) course.

Detailed explanation-4: -Ghaghra, Gandak, Son and Punpun rivers meet Ganga in Bihar.

Detailed explanation-5: -As the Bhagirathi River flows down the Himalayas, it joins the Alaknanda River, officially forming the Ganges River.