The Vana Parva ("Book of the Forest") is the third of the eighteen parvas (books) of the Indian epic Mahabharata. Vana Parva traditionally has 21 parts and 324 chapters. The critical edition of Vana Parva contains 16 parts and 299 chapters. The parva is a chronicle of the twelve-year journey of the Pandavas in a forest, where they learn life lessons and build character. Vana Parva contains discourses on virtues and ethics; myths of Arjuna, Yudhishthara, and Bhima; and the tales of "Nahusha the Snake and Yudhishthira" and "Ushinara and the Hawk".
https://en.wikipedia.org/wiki/Vana_Parva