Mount Arganthonius or Arganthonios (), or Arganthon (Ἀργανθών), or Arganthoneion, was a mountain range in ancient Bithynia, which forms a peninsula, and divides the gulfs of Cius and Astacus. The range terminates in a headland which Ptolemy calls Posidium (modern Bozburun). The name is connected with the myths of Hylas and the Argonautic expedition.Apollon. 1.1176.
Its modern name is Samanli Daği.
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