Kosi River, one of the main rivers in Bihar and a prominent tributary of the Ganges, originates in the Himalayas. Along with its tributaries the Kosi River traverses along parts of Tibet including the Mount Everest region and also one third of the eastern part of Nepal. The river has shifted its course from east to west about 120 kilometers in the last two hundred years.

The Kosi River was previously known as Kausiki and it is on the banks of this river that sage Visvamitra became a Vedic rishi. In the Indian epic Mahabharata this river is mentioned as Kausiki. Seven koshis merge together to form the Saptakoshi River, which is popularly known as Koshi.

In Nepal, Koshi River lies in the west of Kanchenjunga. It has seven major tributaries Sun Koshi, Tama Koshi or Tamba Koshi, Dudh Koshi, Indravati, Likhu, Arun and Tamore or Tamar. This river is also known as the ` Sorrow of Bihar` as it floods Bihar, which results in a huge loss of life and property.

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