SB 5.20.15
tesam varsesu sima-girayo nadyas cabhijñatah sapta saptaiva cakras catuhsrngah kapilas citrakuto devanika urdhvaroma dravina iti rasakulya madhukulya mitravinda srutavinda devagarbha ghrtacyuta mantramaleti.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
In those seven islands there are seven boundary mountains, known as Cakra, Catuhsrnga, Kapila, Citrakuta, Devanika, Urdhvaroma and Dravina. There are also seven rivers, known as Ramakulya, Madhukulya, Mitravinda, Srutavinda, Devagarbha, Ghrtacyuta and Mantramala.