The Roman History · Amm. 23.6.74

We need not detail minutely every portion of the sea-coast on the extremity of Persia, as it would lead us into too long a digression. It will suffice to say that the sea which stretches from the Caspian mountains along the northern side to the straits above mentioned, is nine thousand furlongs in extent; the southern frontier, from the mouth of the Nile to the beginning of Carmania, is fourteen thousand furlongs.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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