Previous Year Question
Which one of the following rivers is NOT the part of Indian Ganga river basin?
Punpun river
Ajoy river
Jalangi river
Jonk river
Correct Answer: D
Detailed Solution
The Jonk River is not a part of the Indian Ganga River Basin; it belongs to the Mahanadi River Basin. The India-WRIS description of the Mahanadi Basin lists the Jonk among the important rivers of the Middle Mahanadi Sub-basin.
The Punpun River is a southern tributary of the Ganga. Its catchment extends over parts of Bihar and Jharkhand, and it ultimately joins the Ganga. Hence, the Punpun clearly forms part of the Ganga Basin.
The Ajoy River originates near Deoghar in Jharkhand, flows towards West Bengal and joins the Bhagirathi near Katwa. Since the Bhagirathi-Hooghly forms part of the Ganga river system, the Ajoy also belongs to the Ganga Basin.
The Jalangi River in West Bengal is associated with the Ganga-Padma–Bhagirathi river system. The Bhairab-Jalangi-Sealmari group has its connection with the Ganga-Padma and subsequently meets the Bhagirathi. Thus, the Jalangi also forms part of the Ganga river system.