The Amphrysus (Ancient Greek: Ἄμφρυσος - Amphrysos[1] or Ἄμφρυσσος - Amphryssos)[2] was a river in ancient Thessaly, flowing from Mount Othrys to the Pagasetic Gulf.

[3] According to Strabo, it flowed close to the walls of the town Halos.

In the Argonautica (I.53) of Apollonius of Rhodes Eupolemeia bore the Argonaut Aethalides to Hermes near the Amphryssos.

In Virgil's Aeneid, 6.398, Virgil refers to the Sibyl (the aged prophetess who accompanies Aeneas to the Underworld) as Amphrysia vates ("Amphrysian seer"), to indicate that she is a priestess of the god Apollo.

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