2. The whole of this country is irrigated by rivers descending from the Alps, the Cevennes, and the Pyrenees, some of which discharge themselves into the ocean, others into the Mediterranean. The districts through which they flow are mostly plains interspersed with hills, and having navigable streams. The course of these rivers is so happily disposed in relation to each other, that you may traffic from one sea to the other,[1308] carrying the merchandise only a small distance, and that easily, across the plains; but for the most part by the rivers, ascending some, and descending others. The Rhone is pre-eminent in this respect, both because it communicates with many other rivers, and also because it flows into the Mediterranean, which, as we have said, is superior to the ocean,[1309] and likewise passes through the richest provinces of Gaul. The whole of the Narbonnaise produces the same fruits as Italy. As we advance towards the north, and the mountains of the Cevennes, the plantations of the olive and fig disappear, but the others remain. Likewise the vine, as you proceed northward, does not easily mature its fruit. The entire of the remaining country produces in abundance corn, millet, acorns, and mast of all kinds. No part of it lies waste except that which is taken up in marshes and woods, and even this is inhabited. The cause of this, however, is rather a dense population than the industry of the inhabitants. For the women there are both very prolific and excellent nurses, while the men devote themselves rather to war than husbandry. However, their arms being now laid aside, they are compelled to engage in agriculture. These remarks apply generally to the whole of Transalpine Keltica. We must now describe particularly each of the four divisions, which hitherto we have only mentioned in a summary manner. And, first, of the Narbonnaise.