Question

The Kosi river is known as the 'Sorrow of Bihar'.

Answer 1

• The Kosi River is known as the "Sorrow of Bihar" as the annual floods affect about 21,000 km² (8,100 sq mi) of fertile agricultural lands thereby disturbing the rural economy.
  
• On 18 August 2008, the Kosi river picked up an old channel it had abandoned over 100 years previously near the border with Nepal and India.
  
• The Kosi river is one of the largest tributaries of the Ganges.
  
• Kosi is known as the "Sorrow of Bihar", as it has caused widespread human suffering in the past due to flooding and very frequent changes in the course when it flows from Nepal to Bihar.