Surya Siddhanta
याम्यायाम् भारते वर्षे लङ्का तद्वन् महापुरी । पश्चिमे केतुमालाख्ये रोमकाख्या प्रकीर्तिता॥
To the southward, in the clime Bharata, is in like manner, the great city Lanka : to the west, in the clime called Ketumala, is declared to be the city named Komaka.
english translation