Ramayana
योजनानां सहस्राणि षष्टिं तु रघुनंदन । बिभिदुर्धरणीं राम रसातलमनुत्तमम् ॥१-३९-२१
Oh ! Rama, the legatee of Raghu's dynasty, thus sixty thousand square yojana-s of the earth was dug over, so as to make the earth's outermost plane as the unsurpassed rasaatala, the sixth subterranean and the nethermost plane. ॥ 1-39-21॥
english translation
yojanAnAM sahasrANi SaSTiM tu raghunaMdana । bibhidurdharaNIM rAma rasAtalamanuttamam ॥1-39-21
hk transliteration by Sanscript