Mahabharata 3.186.89

3.186.89

abhyantaraṃ śarīraṃ me praviśya munisattama |
āssva bho vihito vāsaḥ prasādaste kṛto mayā || 89 ||

And that boy, of eyes like the petals of the lotus, having the mark of Sreevatsa, and possessed of blazing effulgence, then addressed me in words highly pleasant to the ear, saying, 'O sire, I know thee to be fatigued and desirous of rest. O Markandeya of Bhrigu's race, rest thou here as long as thou wishest. O best of Munis, entering within my body, rest thou there. That hath been the abode assigned to thee by me. I have been pleased with thee.' Thus addressed by that boy, a sense of total disregard possessed me in respect both of my long life and state of manhood. Then that boy suddenly opened his mouth, and as fate would have it, I entered his mouth deprived of the power of motion. But O king, having suddenly entered into the stomach of that boy, I behold there the whole earth teeming with cities and kingdoms. And, O best of men, while wandering through the stomach of that illustrious one, I behold the Ganga, the Satudru, the Sita, the Yamuna, and the Kausiki; the Charmanwati, the Vetravati; the Chandrabhaga, the Saraswati, the Sindhu, the Vipasa, and the Godavari; the Vaswokasara, the Nalini and the Narmada; the Tamra, and the Venna also of delightful current and sacred waters; the Suvenna, the Krishna-venna, the Irama, and the Mahanadi; the Vitasti, O great king, and that large river, the Cavery; the one also, O tiger among men, the Visalya, and the Kimpuna also. I beheld all these and many other rivers that are on the earth!