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 mythus of Hylas and the Argonautic expedition. Its modern name is Samanli Daği. References Bithynia Arganthonius Locations in Greek mythology Ancient Greek geography