Dandaka (Sanskrit: दंडक) was the name of aranya or forest, lying between the Godavari and Narmada. It was of vast extent, and some passages of the Ramayana represent it as beginning immediately south of the Yamuna. This forest is the scene of many of Rama and Sita's adventures, and is described as "a wilderness over which separate hermitage are scattered, while wild beasts and Rakshasas everywhere abound."
Dandak was also the kingdom, a colonial state of Lanka under the reign of Ravana. Ravana's governor Khara ruled this province. It was the stronghold of all the Rakshasa tribes living in the Dandaka Forest.
- Source: Dowson's Classical Dictionary of Hindu Mythology