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... arista, poculaque inuentis Acheloia miscuit uuis; et...

Achelous, the longest of all Greek rivers, rising in central Epirus and debouching, after a course fo 240 km into the northwest corner of the Corinthian Gulf. Achelous was personified early as a water- and river-god from whom all seas, rivers and springs derived. (Oxford Classical Dictionary, Third Edition, p.6)