➤ It is the important river of North-Western Bihar. The river originates from Mustang glacier of Annapurna mountain (Nepal) which is located near Manangmot and Kutang.
➤ It is known as Kali in Nepal. It flows into different streams in Nepal. Then, the river enters the Indian Territory near Triveni town in Nepal.
➤ Thereafter, the river flows in a Southerly direction and forms boundary between Uttar Pradesh and Bihar and enters into Bihar from Valmikinagar near Someshwar range.
➤ The total length of Gandak is 425 km out of which it flows for only 260 km in Bihar.
➤ Important tributaries of Gandak are Rohua, Manaur, Bhabsa, Gangri or Gogri, Mahi, Dabra and Avsa rivers.
➤ It flows in the South-East direction over the North Ganga plains.
➤ Hajipur is located on the banks of this river. Valmikinagar Barrage is situated on Gandak river.
➤ It is also known as Triveni, Narayani, Kali Gandak. Triveni canal gets water from Gandak river.