Koshi

The Koshi, often termed the 'Sorrow of Bihar' due to its dramatic shifts in course and catastrophic floods, is also a powerful symbol of nature's raw energy in Mithila. As one of the largest tributaries of the Ganges, it defines the eastern boundary of the region. Despite the challenges it poses, the Koshi is a vital ecological lifeline, creating vast wetlands (Chaur and Maan) that support a rich biodiversity of fish and migratory birds. In Maithil culture, the Koshi is seen as a formidable deity whose temperament must be propitiated through faith and resilience.