+38.+ But as no one up to our time has been able to settle in regard to those parts of Asia and Libya, where they approach each other in the neighbourhood of Ethiopia, whether the continent is continuous to the south, or is surrounded by the sea, so it is in regard to the part between Narbo and the Don: none of us as yet knows anything of the northern extent of this district, and anything we can ever know must be the result of future exploration; and those who rashly venture by word of mouth or written statements to describe this district must be looked upon as ignorant or romancing. My object in these observations was to prevent my narrative being entirely vague to those who were unacquainted with the localities. I hoped that, by keeping these broad distinctions in mind, they would have some definite standard to which to refer every mention of a place, starting from the primary one of the division of the sky into four quarters. For, as in the case of physical sight, we instinctively turn our faces to any object pointed at; so in the case of the mind, our thoughts ought to turn naturally to localities as they are mentioned from time to time. It is time now to return to the story we have in hand. [Sidenote: The length of the march from Carthagena to the Po, 1125 Roman miles.] +39.+ At this period the Carthaginians were masters of the whole Mediterranean coast of Libya from the Altars of Philaenus,[174] opposite the Great Syrtis, to the Pillars of Hercules, a seaboard of over sixteen thousand stades. They had also crossed the strait of the Pillars of Hercules, and got possession of the whole seaboard of Iberia on the Mediterranean as far as the Pyrenees, which separate the Iberes from the Celts—that is, for a distance of about eight thousand stades: for it is three thousand from the Pillars to New Carthage, from which Hannibal started for Italy; two thousand six hundred from thence to the Iber; and from that river to Emporium again sixteen hundred; from which town, I may add, to the passage of the Rhone is a distance of about sixteen hundred stades; for all these distances have now been carefully measured by the Romans and marked with milestones at every eighth stade.[175] After crossing the river there was a march up stream along its bank of fourteen hundred stades, before reaching the foot of the pass over the Alps into Italy. The pass itself was about twelve hundred stades, which being crossed would bring him into the plains of the Padus in Italy. So that the whole length of his march from New Carthage was about nine thousand stades, or 1125 Roman miles. Of the country he had thus to traverse he had already passed almost half in mere distance, but in the difficulties the greater part of his task was still before him. [Sidenote: Coss. P. Cornelius Scipio and Tib. Sempronius Longus. B.C. 218. The Consuls are sent, one to Spain, and the other to Africa.] [Sidenote: Placentia and Cremona.] [Sidenote: Outrage by Boii and Insubres.]