Matsyapurana 121.64

121.64

paraspareṇa dviguṇā dharmataḥ kāmato 'rthataḥ
hemakūṭasya pṛṣṭhe tu sarpāṇāṃ tatsaraḥ smṛtam //

The Surabhi forest stands on the banks of the river Vanśaṅkasârâ. There resides Hiraṇyaśriṅga the most powerful and learned follower of Kuvera who has been forbidden to take any part in the sacrifices. Surrounded by the learned (progeny of Attri) and the Brâhmarakṣasas, the four attendants of Kuvera reside there. The residents of the hills and the mountains attain double powers (by practice) as compared to other folks.—6-164.

At the back of the Hemakûṭa is the lake of the snakes (sarpa) out of which flow the two rivers, Sarasinatî and Jyotiṣmatî falling to the eastern and western seas respectively.—65.