The Roman History · Amm. 22.15.10

Then proceeding more gently, and receiving no accession of waters in Egypt, it falls into the sea through seven mouths, each of which is as serviceable as, and resembles, a separate river. And besides the several streams which are derived from its channel, and which fall with others like themselves, there are seven navigable with large waves; named by the ancients the Heracleotic, the Sebennitic, the Bolbitic, the Phatnitic, the Mendesian, the Tanitic, and the Pelusian mouths.

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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