Pontic Olbia (, ) or simply Olbia was an ancient Greek city on the shore of the Southern Bug estuary (Hypanis or Ὕπανις,) in Ukraine, opposite Berezan Island. It was founded in the 7th century BC by colonists from Miletus. Its harbour was one of the main emporia on the Black Sea for the export of cereals, fish, and slaves to Greece, and for the import of Attic goods to Scythia.