Book IV

of Europe, beginning in the land of the Keltoi, who after the Kynesians dwell furthest towards the sun-setting of all the peoples of Europe; and thus flowing through all Europe it falls into the sea by the side of Scythia. 50. So then it is because these which have been named and many others join their waters together, that Ister becomes the greatest of rivers; since if we compare the single streams, the Nile is superior in volume of water; for into this no river or spring flows, to contribute to its volume. And the Ister flows at an equal level always both in summer and in winter for some such cause as this, as I suppose:⁠—in winter it is of the natural size, or becomes only a little larger than its nature, seeing that this land receives very little rain in winter, but constantly has snow; whereas in summer the snow which fell in the winter, in quantity abundant, melts and runs from all parts into the Ister. This snow of which I speak, running into the river helps to swell its volume, and with it also many and violent showers of rain, for it rains during the summer: and thus the waters which mingle with the Ister are more copious in summer than they are in winter by about as much as the water which the Sun draws to himself in summer exceeds that which he draws in winter; and by the setting of these things against one another there is produced a balance; so that