Srimad Bhagavatam Canto 05, Chapter 20, Text 26

SB 5.20.26

etesam varsa-maryada-girayo nadyas ca sapta saptaiva isana urusrngo balabhadrah satakesarah
sahasrasroto devapalo mahanasa iti anaghayurda ubhayasprstir aparajita pañcapadi sahasrasrutir nijadhrtir
iti.
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
For these lands also, there are seven boundary mountains and seven rivers. The mountains are Isana, Urusrnga, Balabhadra, Satakesara, Sahasrasrota, Devapala and Mahanasa. The rivers are Anagha, Ayurda, Ubhayasprsti, Aparajita, Pañcapadi, Sahasra-sruti and Nijadhrti.
Srimad Bhagavatam Canto 05, Chapter 20, Text 25
Srimad Bhagavatam Canto 05, Chapter 20, Text 27