Gandaki, Pachnad, Sonha

South of the gorge, the river is joined by Rahught Khola at Galeshwor, Myagdi Khola at Beni, Modi Khola near Kushma and Badigaad at Rudrabeni. The river then takes a right-angle turn and runs east....Kali Gandaki is joined by a major tributary, Trishuli, at Devighat, just as the river exits the foothills of the Himalayas into the southern plains of Nepal. Masryangdi is a major tibutary of Trisuli. From Devighat, the river flows southwest and is known as Narayani or Sapt Gandaki. The river later curves back towards the southeast as it enters India. The river flows southeast across the Gangetic plain of Bihar state, eventually merging with the Ganga near at Hajipur, or Patna.The entry point of the river at the Indo-Nepal border is also the confluence of Gandak, known as Triveni, with rivers Pachnad and Sonha also descending into India from Nepal.Pandai river flows into Bihar (India) from Nepal in the eastern end of the Valmiki Sanctuary and meets Masan. its drainage area in India is 7620 sqkm. After the river debaouches into India at Triveni, it travels for a further length of 300 km before it joins the Ganga, just downstream of Hajipur at Sonepur (also known as Harihar Kshetra), near Patna.Before joining the river Ganga near patna, it flows through Champaran, Sarang and Muzaffarpur districts. The total length of the river is 630 km out of which 330 km lies in Nepal and Tibet. Cited from Wiki: Gandaki River