SB 5.20.21
amo madhuruho meghaprsthah sudhama bhrajistho lohitarno vanaspatir iti ghrtaprstha-sutas tesam varsa-
girayah sapta saptaiva nadyas cabhikhyatah suklo vardhamano bhojana upabarhino nando nandanah
sarvatobhadra iti abhaya amrtaugha aryaka tirthavati rupavati pavitravati sukleti.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
The sons of Maharaja Ghrtaprstha were named Ama, Madhuruha, Meghaprstha, Sudhama, Bhrajistha, Lohitarna and Vanaspati. In their island there are seven mountains, which indicate the boundaries of the seven tracts of land, and there are also seven rivers. The mountains are named Sukla, Vardhamana, Bhojana, Upabarhina, Nanda, Nandana and Sarvatobhadra. The rivers are named Abhaya, Amrtaugha, Aryaka, Tirthavati, Rupavati, Pavitravati and Sukla.