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SB 5.24.6

tato ’dhastāc chata-yojanāntara iyaṁ pṛthivī yāvad dhaṁsa-bhāsa-śyena-suparṇādayaḥ patattri-pravarā utpatantīti.
Synonyms: 
tataḥ adhastāt — beneath that; śata-yojana — of one hundred yojanas; antare — by an interval; iyam — this; pṛthivī — planet earth; yāvat — as high as; haṁsa — swans; bhāsa — vultures; śyena — eagles; suparṇa-ādayaḥ — and other birds; patattri-pravarāḥ — the chief among birds; utpatanti — can fly; iti — thus.
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.