The Roman History · Amm. 22.8.9

The sea thus broken, and terminated by mingling with the seas at each end, and now becoming very calm, spreads out into wider waters, as far as the eye can reach both in length and breadth. Its entire circuit, if one should measure it as one would measure an island, sailing along its shores, is 23,000 furlongs according to Eratosthenes, Hecatæus, and Ptolemy, and other accurate investigators of subjects of this kind, resembling, by the consent of all geographers, a Scythian bow, held at both ends by its string.

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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