The Pleistos (, ) is a river in central Greece. It rises at Mount Parnassos near the town Arachova, Boeotia. It flows west through a deep valley, passing south of Delphi, and flows into the Corinthian Gulf near Kirra. Solon of Athens is said to have used hellebore roots to poison the water in an aqueduct leading from the River Pleistos around 590 BC during the siege of Kirrha. The river Pleistos was also mentioned by the ancient geographers Strabo and Pausanias.

The Pleistos (, ) is a river in central Greece. It rises at Mount Parnassos near the town Arachova, Boeotia. It flows west through a deep valley, passing south of Delphi, and flows into the Corinthian Gulf near Kirra. Solon of Athens is said to have used hellebore roots to poison the water in an aqueduct leading from the River Pleistos around 590 BC during the siege of Kirrha. The river Pleistos was also mentioned by the ancient geographers Strabo and Pausanias.