Matsyapurana 122.38

122.38

ānandāśca sukhāścaiva kṣemakāśca navaiḥ saha
varṇāśramācārayutā deśāste sapta viśrutāḥ //

It is very difficult to enumerate and give proper measurements of all those rivers and rivulets. They are all sacred. The people of the janapadas who drink their waters get happiness. Śântabhaya, Pramâda, Śiva, Ânanda, Sukha, Kṣemaka, and Nava; such are the seven janapadas situated there, where all the rules and customs (Âchâra) of Varṇa and Âśrama are observed.—36-38.