Jura
Place
Gallic War 1.2 supplies the first indexed source portrait: “… To this he the more easily persuaded them, because the Helvetii, are confined on every side by the nature of their situation; on one side by the Rhine , a very broad and deep river, which separates the Helvetian territory from the Germans; on a second side by the Jura , a very high mountain, which is [situated] between the Sequani and the Helvetii; on a …”
Named form in selected editions; identity established only to the extent of the cited context.
Gallic War 1.2
Caesar
… To this he the more easily persuaded them, because the Helvetii, are confined on every side by the nature of their situation; on one side by the Rhine , a very broad and deep river, which separates the Helvetian territory from the Germans; on a second side by the Jura , a very high mountain, which is [situated] between the Sequani and the Helvetii; on a third by the Lake of Geneva, and by the river Rhone, which separates our Province from the Helvetii. …
Gallic War 1.6
Caesar
There were in all two routes, by which they could go forth from their country one through the Sequani narrow and difficult, between Mount Jura and the river Rhone (by which scarcely one wagon at a time could be led; there was, moreover, a very high mountain overhanging, so that a very few might easily intercept them; the other, through our Province, much easier and freer from obstacles, because the Rhone flows between the boundaries of the Helvetii and those of the Allobroges, who had lately been subdued, and is in some places crossed by a ford. …
Gallic War 1.8
Caesar
Meanwhile, with the legion which he had with him and the soldiers which had assembled from the Province, he carries along for nineteen [Roman, not quite eighteen English] miles a wall, to the height of sixteen feet, and a trench, from the Lake of Geneva, which flows into the river Rhone, to Mount Jura, which separates the territories of the Sequani from those of the Helvetii. …
Geographical record
Pleiades representative point · precise
The Jura Mountains, a sub-alpine mountain range located to the north of the western Alps, separate the Rhine and Rhone rivers.
Pleiades 177544 · CC BY 3.0 · Barrington Atlas: BAtlas 18 D3 Iura M.