Strabo, Geography
H.C. Hamilton, Esq., W. Falconer, M.A., Ed.

East of this is Keltica, which extends as far as the Rhine. Its northern side is washed by the entire of the British Channel, for this island lies opposite and parallel to it throughout, extending as much as 5000 stadia in length. Its eastern side is bounded by the river Rhine, whose stream runs parallel with the Pyrenees; and its southern side commencing from the Rhine, [is bounded] partly by the Alps, and partly by Our Sea; where what is called the Galatic Gulf¹ runs in, and on this are situated the far-famed cities of Marseilles and Narbonne. Right opposite to the Gulf on the other side of the land, lies another Gulf, called by the same name, Galatic,² look- ing towards the north and Britain. It is here that the breadth of Keltica is the narrowest, being contracted into an isthmus less than 3000 stadia, but more than 2000. Within this region there is a mountain ridge, named Mount Cemme- nus,³ which runs nearly at right angles to the Pyrenees, and terminates in the central plains of Keltica.⁴ The Alps, which are a very lofty range of mountains, form a curved line, the convex side of which is turned towards the plains of Keltica, mentioned before, and Mount Cemmenus, and the concave towards Liguria⁵ and Italy.

The Alps are inhabited by numerous nations, but all Keltic with the exception of the Ligurians, and these, though of a different race, closely resemble them in their manner of life. They inhabit that portion of the Alps which is next the Apennines, and also a part of the Apennines themselves. This latter mountain ridge traverses the whole length of Italy from north to south, and terminates at the Strait of Sicily.