kosi river

The Koshi River or Kośi River, is a transboundary river between Nepal and India and is one of the largest tributaries of the Ganga. The river along with its tributaries, drains a total area of 69300 sqkm up to its confluence with the Ganga in India (29,400sqkm in Tibet, 30,700 km² in Nepal and 9,200 sqkm in India), a part of Tibet (China) including the Mount Everest region as well as the eastern one third of Nepal.The river basin is surrounded by the ridges separating it from the Brahmaputrain the north, the Gandaki in the west, Mahananda in the east and by the Ganga in the south. The river is joined by major tributaries, approximately 48 km north of the Indo-Nepal border, breaking into more than twelve distinct channels with shifting courses due to flooding.[1][2]Kamlā, Bāghmati (Kareh) and Budhi Gandak are major tributaries of Koshi in India, besides minor tributaries like Bhutahi Balān.[1][2] Over the last 250 years, the Koshi River has shifted over 120 km from east to west.[3] and the unstable nature of the river is attributed to the heavy silt which it carries during the monsoon season. Flooding in India has extreme effects. India is second in the world after Bangladesh in deaths due to flooding, accounting for one fifth of global flooding deaths.

http://en.wikipedia.org/wiki/Kosi_River