Res Gestae

The origin of the sources of the Nile (so at least I am wont to think) will be unknown also to future ages, as it has been up to the present. But, since the poets’ tales and dissenting geographers give varying accounts of this unknown subject, I shall succinctly set forth such of their views as in my opinion approach the truth.

Some natural philosophers affirm that in the tracts lying beneath the north, when the cold winters freeze everything, great masses of snow are congealed; that afterwards when these are melted by the heat of the blazing sun, they form clouds filled with flowing moisture, which are then driven towards the south by the Etesian winds,[*](Periodic winds which blow yearly in the dog-days, according to Colum. xi. 2, 56, from August 1 to 30; cf. Pliny, N.H. ii. 124; xviii. 270 f. The Prodromoi, forerunners, mentioned below in section 7, begin eight days earlier.) and when melted by the excessive warmth, are believed to cause the rich overflow of the Nile.

Others assert that it is by the Aethiopian rains, which are said to fall in abundance in those regions in the season of torrid heat, that its floods are raised at the appointed season of the year; but both these reasons seem to

Another, more widespread opinion is, that when the Prodromoi blow and after them the Etesians for forty-five consecutive days, since they drive back the course of the river and check its speed, it swells with overflowing waves; and while the contrary wind blows against it, it increases more and more, since on the one side the force of the wind hurls it back and on the other the flow of its perennial springs forces it onward; and rising high it covers everything, and hiding the ground, over the low-lying plains it has the appearance of a sea.

But King Juba,[*](The one whom Julius Caesar led in triumph; Octavian later made him his friend and restored his kingdom to him; Pliny, N.H. v. 16.) relying upon the testimony of Punic books, thinks that the Nile rises in a mountain situated in Mauritania and looking down upon the ocean, and he says that this is proved by the fact that in those marshes[*](Those from which the river flows. ) are found fishes, plants, and animals like those of the Nile.

But the river, flowing through the regions of Aethiopia, and going under various names, which many nations have given it in its course over the earth, swelling with its rich flood, comes to the cataracts, which are steep rocks, from which it plunges headlong rather than flows; for which reason the Ati, who formerly lived nearby, since their hearing was impaired by the continual roar, were forced to change their abode to a quieter spot.

Flowing more gently from there, through seven

Rising, then, in the quarter which has been mentioned, it passes from the marshes[*](Ammianus seems to accept King Juba’s opinion; cf. section 8, above.) as far as the cataracts and forms many islands, some of which (it is said) extend over such wide-spread spaces that the stream hardly leaves each of them behind on the third day.