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SB 5.24.7

upavarṇitaṁ bhūmer yathā-sanniveśāvasthānam avaner apy adhastāt sapta bhū-vivarā ekaikaśo yojanāyutāntareṇāyāma-vistāreṇopakḷptā atalaṁ vitalaṁ sutalaṁ talātalaṁ mahātalaṁ rasātalaṁ pātālam iti.
Synonyms: 
upavarṇitam — stated previously; bhūmeḥ — of the planet earth; yathā-sanniveśa-avasthānam — according to the arrangement of the different places; avaneḥ — the earth; api — certainly; adhastāt — beneath; sapta — seven; bhū-vivarāḥ — other planets; eka-ekaśaḥ — in succession, up to the outer limit of the universe; yojana-ayuta-antareṇa — with an interval of ten thousand yojanas (eighty thousand miles); āyāma-vistāreṇa — by width and length; upakḷptāḥ — situated; atalam — named Atala; vitalam — Vitala; sutalam — Sutala; talātalam — Talātala; mahātalam — Mahātala; rasātalam — Rasātala; pātālam — Pātāla; iti — thus.
Translation: 
My dear King, beneath this earth are seven other planets, known as Atala, Vitala, Sutala, Talātala, Mahātala, Rasātala and Pātāla. I have already explained the situation of the planetary systems of earth. The width and length of the seven lower planetary systems are calculated to be exactly the same as those of earth.