Bhagavatapurana 5.20.37

5.20.37

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sa loka-trayānte parita īśvareṇa vihito yasmāt sūryādīnāṃ dhruvāpavargāṇāṃ jyotir-gaṇānāṃ gabhastayo 'rvācīnāṃs trīn lokān āvitanvānā na kadācit parācīnā bhavitum utsahante tāvad un-nahanāyāmaḥ //

37. Since that chain of mountains is placed by the Almighty Lord all round the three worlds, it is also made so high all round that the rays of the innumerable luminaries (in the sky) from the sun to Dhruva (Pole star) do not go beyond it, but only shed light into the three worlds below, (enclosed by the chain).