Mounts Caucasus, Comedorum, and Paropemisidae are joined together
between Bactria and India, and give birth to the river Oxus which
takes its rise in these mountains and flows 500 miles towards the
North and as many towards the West, and discharges its waters into
the Caspian sea; and is accompanied by the Oxus, Dargados, Arthamis,
Xariaspes, Dargamaim, Ocus and Margus, all very large rivers. From
the opposite side towards the South rises the great river Indus
which sends its waters for 600 miles Southwards and receives as
tributaries in this course the rivers Xaradrus, Hyphasis, Vadris,
Vandabal Bislaspus to the East, Suastes and Coe to the West, uniting
with these rivers, and with their waters it flows 800 miles to the
West; then, turning back by the Arbiti mountains makes an elbow and
turns Southwards, where after a course of about 100 miles it finds
the Indian Sea, in which it pours itself by seven branches. On the
side of the same mountains rises the great Ganges, which river flows
Southwards for 500 miles and to the Southwest a thousand ... and
Sarabas, Diarnuna, Soas and Scilo, Condranunda are its tributaries.
It flows into the Indian sea by many mouths.

On the natives of hot countries.