Srimad-Bhagavatam: Canto 5 - Chapter 1 - Verse 6
Sanskrit:
ततोऽधस्ताच्छतयोजनान्तर इयं पृथिवी यावद्धंसभासश्येनसुपर्णादय: पतत्त्रिप्रवरा उत्पतन्तीति ॥ ६ ॥
ITRANS:
tato ’dhastāc chata-yojanāntara iyaṁ pṛthivī yāvad dhaṁsa-bhāsa-śyena-suparṇādayaḥ patattri-pravarā utpatantīti.
Translation:
Below the abodes of the Yakṣas and Rākṣasas by a distance of 100 yojanas [800 miles] is the planet earth. Its upper limits extend as high as swans, hawks, eagles and similar large birds can fly.