Mahabharat
गच्छन्ति पूर्वाद अपरं समुद्रं चापि दक्षिणम उत्तरं तु न गच्छन्ति विना तात पतत्रिभिः ॥ २-४९-१६ ॥
'People go to the Eastern or the Western seas and also to the Southern one. But, O father, none except birds can ever go to the Northern sea.' ॥ 2-49-16 ॥
english translation
gacchanti pUrvAda aparaM samudraM cApi dakSiNama uttaraM tu na gacchanti vinA tAta patatribhiH ॥ 2-49-16 ॥
hk transliteration by Sanscript