The Histories · 2.23

As for him who talked about the Ocean, he carried his tale into the region of the unknown, and so he need not be refuted; since I for my part know of no river Ocean existing, but I think that Homer or one of the poets who were before him invented the name and introduced it into his verse.

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
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