9. If, then, to the distance between Rhodes and the Dnieper be added four thousand stadia north of the latter place, the whole would come to 12,700 stadia; and since from Rhodes to the southern limit of the habitable earth there are 16,600 stadia, its total breadth from north to south would be under 30,000 stadia.728 Its length from west to east is stated at 70,000 stadia, the distance being measured from the extremities of Iberia to those of India, partly over the land and partly across the sea. That this length is contained within the quadrilateral aforesaid, is proved by the proportion borne by these parallels to the equator. Thus the length of the habitable earth is above twice its breadth. It has been compared in figure to a chlamys, or soldier’s cloak, because if every part be carefully examined, it will be found that its breadth is greatly diminished towards the extremities, especially in the west.
10. We have now been tracing upon a spherical surface the region which we state to be occupied by the habitable earth; and whoever would represent the real earth as near as possible by artificial means, should make a globe like that of Crates, and upon this describe the quadrilateral within which his chart of geography is to be placed. For this purpose, however, a large globe is necessary, since the section mentioned, though but a very small portion of the entire sphere, must be capable of properly containing all the regions of the habitable earth, and presenting an accurate view of them to all those who wish to consult it. Any one who is able will certainly do well to obtain such a globe. But it should have a diameter of not less than ten feet: those who cannot obtain a globe of this size, or one nearly as large, had better draw their chart on a plane-surface, of not less than seven feet. Draw straight lines, some parallel, for the parallels [of latitude], and others at right angles to these; we may easily imagine how the eye can transfer the figure and extent [of these lines] from a plane-surface to one that is spherical. What we have just observed of the circles in general, may be said with equal truth touching the oblique circles. On the globe it is true that the meridians of each country passing the pole have a tendency to unite in a single point, nevertheless on the plane-surface of the map, there would be no advantage if the right lines alone which should represent the meridians were drawn slightly to converge. The necessity for such a proceeding would scarcely ever be really felt. Even on our globe itself729 the tendency of those meridians (which are transferred to the map as right lines) to converge is not much, nor any thing near so obvious as their circular tendency.
11. In what follows we shall suppose the chart drawn on a plane-surface; and our descriptions shall consist of what we ourselves have observed in our travels by land and sea, and of what we conceive to be credible in the statements and writings of others. For ourselves, in a westerly direction we have travelled from Armenia to that part of Tyrrhenia730 which is over against Sardinia; and southward, from the Euxine to the frontiers of Ethiopia.731 Of all the writers on Geography, not one can be mentioned who has travelled over a wider extent of the countries described than we have. Some may have gone farther to the west, but then they have never been so far east as we have; again, others may have been farther east, but not so far west; and the same with respect to north and south. However, in the main, both we and they have availed ourselves of the reports of others, from which to describe the form, the size, and the other peculiarities of the country, what they are and how many, in the same way that the mind forms its conceptions from the information of the senses. The figure, colour, and size of an apple, its scent, feel to the touch, and its flavour, are particulars communicated by the senses, from which the mind forms its conception of an apple. So in large figures, the senses observe the various parts, while the mind combines into one conception what is thus seen. And in like manner, men eager after knowledge, trusting to those who have been to various places, and to [the descriptions of] travellers in this or that country, gather into one sketch a view of the whole habitable earth.
In the same way, the generals perform every thing, nevertheless, they are not present every where, but most of their success depends on others, since they are obliged to trust to messengers, and issue their commands in accordance with the reports of others. To pretend that those only can know who have themselves seen, is to deprive hearing of all confidence, which, after all, is a better servant of knowledge than sight itself.
12. Writers of the present day can describe with more certainty [than formerly] the Britons, the Germans, and the dwellers on either side of the Danube, the Getæ,732 the Tyrigetæ, the Bastarnæ,733 the tribes dwelling by the Caucasus, such as the Albanians and Iberians.734 We are besides possessed of a description of Hyrcania735 and Bactriana in the Histories of Parthia written by such men as Apollodorus of Artemita,736 who have detailed the boundaries [of those countries] with greater accuracy than other geographers.
The entrance of a Roman army into Arabia Felix under the command of my friend and companion Ælius Gallus,737 and the traffic of the Alexandrian merchants whose vessels pass up the Nile and Arabian Gulf738 to India, have rendered us much better acquainted with these countries than our predecessors were. I was with Gallus at the time he was prefect of Egypt, and accompanied him as far as Syene and the frontiers of Ethiopia, and I found that about one hundred and twenty ships sail from Myos-hormos739 to India, although, in the time of the Ptolemies, scarcely any one would venture on this voyage and the commerce with the Indies.
13. Our first and most imperative duty740 then, both in respect to science and to the necessities of the man of business, is to undertake to lay down the projection of the different countries on the chart in as clear a style as possible, and to signify at the same time the relation and proportion they bear to the whole earth. For such is the geographer’s peculiar province. It belongs to another science to give an exact description of the whole earth, and of the entire vertebre of either zone, and as to whether the vertebre in the opposite quarter of the earth is inhabited. That such is the case is most probable, but not that it is inhabited by the same race of men as dwell with us. And it must therefore be regarded as another habitable earth. We however have only to describe our own.
14. In its figure the habitable earth resembles a chlamys, or soldier’s cloak, the greatest breadth of which would be indicated by a line drawn in the direction of the Nile, commencing from the parallel of the Cinnamon Country, and the Island of the Egyptian Exiles, and terminating at the parallel of Ierna; and its length by a line drawn from the west at right angles to the former, passing by the Pillars of Hercules and the Strait of Sicily to Rhodes and the Gulf of Issus,741 then proceeding along the chain of the Taurus, which divides Asia, and terminating in the Eastern Ocean,742 between India and the Scythians dwelling beyond Bactriana.
We must therefore fancy to ourselves a parallelogram, and within it a chlamys-shaped figure, described in such a manner that the length of the one figure may correspond to the length and size of the other, and likewise breadth to breadth. The habitable earth will therefore be represented by this kind of chlamys. We have before said that its breadth is marked out by parallels bounding its sides, and separating on either side the portions that are habitable from those that are not. On the north [these parallels] pass over Ierna,743 and on the side of the torrid zone over the Cinnamon Country. These lines being produced east and west to the opposite extremities of the habitable earth, form, when joined by the perpendiculars falling from their extremities, a kind of parallelogram. That within this the habitable earth is contained is evident, since neither its greatest breadth nor length project beyond. That in configuration it resembles a chlamys is also clear, from the fact that at either end of its length, the extremities taper to a point.744 Owing to the encroachments of the sea, it also loses something in breadth. This we know from those who have sailed round its eastern and western points. They inform us that