Rakshasa kingdom refers to the territory of Rakshasas who were a tribe, mentioned along with others like Devas (including Rudras, Maruts, Vasus and Adityas), Asuras (including Daityas, Danavas and Kalakeyas), Pisachas, Gandharvas, Kimpurushas, Vanaras, Suparnas, Kinnaras, Bhutas and Yakshas.
Rakshasas were described to have large bodies, probably due to their continuous life in cold climates over snow-covered mountains.
The two epics Mahabharata and Ramayana and many Puranas attest that Rakshasas, Yakshas and Gandharvas were related and had inter-marriages.
Ravana was the most famous Rakshasa who ruled from the Trikuta mountains of Lanka where the climatic conditions were similar to Himalayas.
Khara's kingdom was in south-central India, in a dense forest named Dandaka.