The Roman History · Amm. 22.8.46

But the whole sea, all around, is full of mists and shoals, and is sweeter than seas in general, because by the evaporation of moisture the air is often thick and dense, and its waters are tempered by the immensity of the rivers which fall into it; and it is full of shifting shallows, because the number of the streams which surround it pour in mud and lumps of soil.

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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