Mbh 6.11.8b

Sukumari, and Kumari, and Seta, and Keveraka, and Mahanadi, O Kauravya, and the river Manijala, and Chakshus, and the river Vardhanika, O thou best of the Bharatas,--these and many other rivers by thousands and hundreds, all full of sacred water, are there, O perpetuator of Kuru’s race, from which Vasava draweth water for showering it as rain. It is impossible to recount the names and lengths of rivers. All of them are foremost of rivers and sin-cleansing. As heard by all men there, in that island of Saka, are four sacred provinces. They are the Mrigas, the Masakas, the Manasas, and the Mandagas. The Mrigas for the most part are Brahmanas devoted to the occupations of their order. Amongst the Masakas are virtuous Kshatriyas granting (unto Brahmanas) every wish (entertained by them). The Manasas, O king, live by following the duties of the Vaisya order. Having every wish of theirs gratified, they are also brave and firmly devoted to virtue and profit. The Mandagas are all brave Sudras of virtuous behaviour. In these provinces, O monarch, there is no king, no punishment, no person that deserves to be punished. Conversant with the dictates of duty they are all engaged in the practice of their respective duties and protect one another. This much is capable of being said of the island called Saka. This much also should be listened to about that island endued with great energy.’”[68]