Payoshni is an ancient river mentioned in the epic Mahābhārata. Pandavas had visited this place as part of their pilgrimage. It lies in the territory of Vidarbha. Payoshni is mentioned as lying in the northern entrance of the great Dandaka Forest, an ancient forest that is spread throughout south-central India.
With the geographical description mentioned in epic Mahabharata, modern days river Tapti is considered as Payoshni river.
References
Payoshni Wikipedia(Text) CC BY-SA