Shiva Purana
ब्राह्मणाः क्षत्त्रिया वैश्याश्शूद्राश्चानुक्रमोदिताः ॥ संति तत्र महानद्यस्सप्तान्यास्तु सहस्रशः ॥ ४९॥
Brahmins, Kṣatriyas, Vaiśyas and Śūdras live there in their due order. There are seven great rivers and thousands of other small rivers there.
english translation
brAhmaNAH kSattriyA vaizyAzzUdrAzcAnukramoditAH ॥ saMti tatra mahAnadyassaptAnyAstu sahasrazaH ॥ 49॥
hk transliteration by Sanscript