References in Mahabharata
There is a town of the name of Sakala, a river of the name of Apaga, and a clan of the Vahikas known by the name of the Jarttikas (Mbh 8:44). Nakula, proceeding to Sakala, the city of the Madras, made his uncle Shalya accept from affection the sway of the Pandavas (Mbh 2:31).
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