Vishnupurana 2.3.8-9

2.3.8

yojanānāṃ sahasraṃ tu dvīpo 'yaṃ dakṣiṇottarāt
pūrve kirātā yasyānte paścime yavanāḥ sthitāḥ //

The Varsha of Bhárata is divided into nine portions, which I will name to you; they are Indra-dwípa, Kaserumat, Támravarńa, Gabhastimat, Nága-dwípa, Saumya, Gandharba, and Váruńa; the last or ninth Dwípa is surrounded by the ocean, and is a thousand Yojanas from north to south.

On the east of Bhárata dwell the Kirátas (the barbarians); on the west, the Yavanas; in the centre reside Brahmans, Kshetriyas, Vaiśyas, and Śúdras, occupied in their respective duties of sacrifice, arms, trade, and service.

2.3.9

brāhmaṇāḥ kṣatriyā vaiśyā madhye śūdrāś ca bhāgaśaḥ
ijyāyudhavaṇijyādyair vartayanto vyavasthitāḥ //

On the east of Bhárata dwell the Kirátas (the barbarians); on the west, the Yavanas; in the centre reside Brahmans, Kshetriyas, Vaiśyas, and Śúdras, occupied in their respective duties of sacrifice, arms, trade, and service.