Ἰνδικά 4: FRAGM. IV. · Strabo, XV. i. 11,— p. 689. · Of the Boundaries and Extent of India.

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India is bounded on the north by the extremities of Tauros, and from Ariana to the Eastern Sea by the mountains which are variously called by the natives of these regions Parapamisos, and Hemodos, and Himaos, and other names, but by the Macedonians Kaukasos. The boundary on the west is the river Indus, but the southern and eastern sides, which are both much greater than the others, run out into the Atlantic Ocean. The shape of the country is thus rhomboidal, since each of the greater sides exceeds its opposite side by 3000 stadia, which is the length of the promontory common to the south and the east coast, which projects equally in these two directions. [The length of the western side, measured from the Kaukasian mountains to the southern sea along the course of the river Indus to its mouths, is said to be 13,000 stadia, so that the eastern side opposite, with the addition of the 3000 stadia of the promontory, will be somewhere about 16,000 stadia. This is the breadth of India where it is both smallest and greatest.]
The length from west to east as far as Palibothra can be stated with greater certainty, for the royal road which leads to that city has been measured by schoeni, and is in length 10,000 stadia. The extent of the parts beyond can only be conjectured from the time taken to make voyages from the sea to Palibothra by the Ganges, and may be about 6000 stadia. The entire length, computed at the shortest, will be 16,000 stadia. This is the estimate of Eratosthenes, who says he derived it principally from the authoritative register of the stages on the Royal Road. Herein Megasthenes agrees with him. [Patrokles, however, makes the length less by 1000 stadia.] Conf. Arr. Ind. iii. 1-5.