Vishnupurana 2.4.71

2.4.71

śākadvīpastu maitreya kṣirodena samāvṛtaḥ /
śākadvīpapramāṇena valayeneva veṣṭitaḥ //

The sons of Bhavya, the king of Śáka-dwípa, after whom its Varshas were denominated, were Jalada, Kumára, Sukumára, Maníchaka, Kusumoda, Maudákí, and Mahádruma. The seven mountains separating the countries were Udayagiri, Jaládhára, Raivataka, Śyáma, Ámbikeya, Ramya, and Keśarí. There grows a large Sáka (Teak) tree, frequented by the Siddhas and Gandharbas, the wind from which, as produced by its fluttering leaves, diffuses delight. The sacred lands of this continent are peopled by the four castes. Its seven holy rivers, that wash away all sin, are the Sukumárí, Kumárí, Naliní, Dhenuká, Ikshu, Venuká, and Gabhastí. There are also hundreds and thousands of minor streams and mountains in this Dwípa: and the inhabitants of Jalada and the other divisions drink of those waters with pleasure, after they have returned to earth from Indra's heaven. In those seven districts there is no dereliction of virtue; there is no contention; there is no deviation from rectitude. The caste of Mriga is that of the Brahman; the Mágadha, of the Kshetriya; the Mánasa, of the Vaiśya; and the Mandaga of the Śúdra: and by these Vishńu is devoutly worshipped as the sun, with appropriate ceremonies. Śáka-dwípa is encircled by the sea of milk, as by an armlet, and the sea is of the same breadth as the continent which it embraces