Physical Geography of India: Which river is known as the 'Sorrow of Bihar'?

The Kosi River earned the title 'Sorrow of Bihar' due to its devastating floods and frequent channel changes that have caused immense damage to life and property. Originating in Nepal and flowing through Bihar, the Kosi carries heavy silt loads during monsoons, causing it to change course frequently across the plains. Its unpredictable behavior has resulted in widespread flooding, displacement of populations, and destruction of agricultural land, making it one of India's most notorious rivers for flood-related disasters.