Greek city in ancient Thrace
Serrion Teichos () or Serreion Teichos (Σέρρειον τεῖχος) was a Greek city in ancient Thrace, located in the region of the Propontis. It was a member of the Delian League and appears in tribute lists of Athens between 428/7 and 418/7 BCE. It later bore the name of Ganus or Ganos (Γάνος or Γᾶνος). It is under this name that the town is mentioned by geographers and historians, as a noted mountain fortress of Thrace.
Its site is near the modern Ganos, Turkey.
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