Like the Shakas, Pahlavas, Kambojas, Paradas, a section of the Rishikas had also migrated to west/south-west India prior to Christian era.
But the Udyoga-Parva of Mahabharata groups the Pahlavas with the Sakas, Paradas and the Kambojas-Rishikas and locates them all in/around Anupa region in western India.
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According to Vayu Purana and Matsya Purana, river Chakshu (Oxus or Amu Darya) flowed through the countries of Pahlavas, Tusharas, Lampakas, Paradas and the Sakas etc.