4.47.2
As many of them as are famous and can be entered from the sea, I shall name. There is the Ister, which has five mouths, and the Tyras, and Hypanis, and Borysthenes, and Panticapes, and Hypacuris, and Gerrhus, and Tanaïs. Their courses are as I shall indicate.
ch. 48
4.48.1
The Ister, the greatest of all rivers which we know, flows with the same volume in summer and winter; it is most westerly Scythian river of all, and the greatest because other rivers are its tributaries.
4.48.2
Those that make it great, five flowing through the Scythian country, are these: the river called by Scythians Porata and by Greeks Pyretus, note and besides this the Tiarantus, the Ararus, the Naparis, and the Ordessus.
4.48.3
The first-named of these rivers is a great stream flowing east and uniting its waters with the Ister; the second, the Tiarantus, is more westerly and smaller; the Ararus, Naparis, and Ordessus flow between these two and pour their waters into the Ister.
ch. 49
4.49.1
These are the native-born Scythian rivers that help to swell it; but the Maris river, which commingles with the Ister, flows from the Agathyrsi. The Atlas, Auras, and Tibisis, three other great rivers that pour into it, flow north from the heights of Haemus. note The Athrys, the Noes, and the Artanes flow into the Ister from the country of the Crobyzi in Thrace; the Cius river, which cuts through the middle of Haemus, from the Paeonians and the mountain range of Rhodope.
4.49.2
The Angrus river flows north from Illyria into the Triballic plain and the Brongus river, and the Brongus into the Ister, which receives these two great rivers into itself. The Carpis and another river called Alpis also flow northward, from the country north of the Ombrici, to flow into it;
4.49.3
for the Ister traverses the whole of Europe, rising among the Celts, who are the most westerly dwellers in Europe, except for the Cynetes, and flowing thus clean across Europe it issues forth along the borders of Scythia.
ch. 50
4.50.1
With these rivers aforesaid, and many others, too, as its tributaries, the Ister becomes the greatest river of all, while river for river the Nile surpasses it in volume, since that owes its volume of water to no tributary river or spring.
4.50.2
But the Ister is always the same height in summer and winter, the reason for which, I think, is this. In winter it is of its customary size, or only a little greater than is natural to it, for in that country in winter there is very little rain, but snow everywhere.
4.50.3
In the summer, the abundant snow that has fallen in winter melts and pours from all sides into the Ister; so this snow-melt pours into the river and helps to swell it and much violent rain besides, as the summer is the season of rain.
