What is "charmanwati"

Charmanwati alias Charmanvati, was a river mentioned in the epic Mahabharata. It is identified as the modern-day Chambal river, a tributary of Yamuna. This river was one of the destinations (along with other rivers like Ganges and Yamuna) of the people who migrated from river Saraswati, as it dried up, due to its proximity. The word Chambal has the meaning fish in some of the Dravidian languages like Telugu. The Matsya rulers had their origin from the banks of this river. The word Matsya also means fish in Sanskrit''. Thus the banks of this river is thought to be the cradle of a fishermen community who later attained kingship.