Naradapurana 2.8.14

Nāradapurāṇa 2.8.14

daśaikasāhasramitaśca mūle tatsaṃkhyayā vistaratāṃ gato 'sau /
dairghyeṇa tāvanti hi yojanāni trailokyayaṣṭīva samucchrito 'sau //