The Great Epic of the Bhārata dynasty 6.7.47

6.7.47

dṛśyādṛśyā ca bhavati tatra tatra sarasvatī |
etā divyāḥ sapta gaṅgāstriṣu lokeṣu viśrutāḥ || 47 ||

As regards the Saraswati, in some parts (of her course) she becometh visible and in some parts not so. This celestial sevenfold Ganga is widely known over the three worlds. Rakshasas reside on Himavat, Guhyakas on Hemakuta, and serpents and Nagas on Nishadha, and ascetics on Gokarna. The Sweta mountains are said to be the abode of the celestial and the Asuras. The Gandharvas always reside on Nishadhas, and the regenerate Rishis on Nila. The mountains of Sringavat also are regarded as the resort of the celestials.