Between _Augela_ and _See-wah_, the next town towards Cairo (and probably the _Siropum_ of Ptolemy) the road passes over a chain of very high mountains, named in these times _Gerdobah_: and this is unquestionably the same ridge that terminates on the Mediterranean, a few days journey farther on; and which by the suddenness of its descent towards the sea, was antiently named _Catabathmus_. This chain or ridge divided _Cyrene_ from _Marmarica_. The scite of the antient Temple of _Jupiter Ammon_, was a few days journey (perhaps four or five) inland from the plain of Gegabib, so often mentioned. I think I may venture to say this on the authority of Herodotus, Strabo, Pliny, and Arrian; from each of whom, some particulars may be collected respecting its situation. First, Herodotus says, (Book IV.) that the Temple is situated ten days from _Ægila_; (frequented by the Nasamones on account of the dates) and on the road from Thebes to _Ægila_. Next, Arrian says, on the authority of Aristobulus, that Alexander went to it, from the scite of his new city of Alexandria, along the sea coasts of Egypt and Marmarica, to _Paraetonium_: which latter was situated, according to the same authority, sixteen hundred stadia from Alexandria. Pliny gives it at two hundred Roman miles (Book V.) These accounts are perfectly conclusive; and the position of _Paraetonium_, is also very clear in Ptolemy; and is moreover known to the Moderns under the name of _Al Bareton_: so that no difficulty can arise here. Arrian says farther, that Alexander struck inland from _Paraetonium_, and entered the Desart: but he does not say how far the Temple lay from the sea coast. This is supplied by Strabo, (Book XXVII.) who gives the distance at thirteen hundred stadia. Allowing these to produce one hundred and thirty, or one hundred and forty miles; and taking Herodotus’s ten days from Augela at one hundred and seventy (we must not consider them as _caravan_ journies, but as _ordinary_ ones) the meeting of these lines of distance, place the Temple in latitude twenty-nine degrees, and a small fraction; and in a South Westerly direction from Parætonium. Pliny says, (Book V.) that the Temple is four hundred [Roman] miles from Cyrene; that is, twice as far as Parætonium is from Alexandria: and this agrees with the former position. Lastly, Ptolemy places it one hundred and ninety-five geographic miles from _Paraetonium_; and from _Cyrene_ three hundred and forty.—But Ptolemy’s scale, in Africa Tab. III. gives too much distance (as I have said before), and corrected, it should be one hundred and sixty-six from Parætonium. As these authorities do not vary amongst themselves more than thirty miles, I consider them as conclusive.