Acrocorinth (Greek: Ακροκόρινθος), "Upper Corinth", the acropolis of ancient Corinth, is a monolithic rock overseeing the ancient city of Corinth, Greece. "It is the most impressive of the acropoleis of mainland Greece," in the estimation of George Forrest. Acrocorinth was continuously occupied from archaic times to the early 19th century.
The city's archaic acropolis, already an easily defensible position due to its geomorphology, was further heavily fortified during the Byzantine Empire as it became the seat of the strategos of the thema of Hellas and later of the Peloponnese. It was defended against the Crusaders for three years by Leo Sgouros.
The Upper Pirene spring is located within the encircling walls. The spring, which is behind the temple, they say was the gift of Asopus to Sisyphus. The latter knew, so runs the legend, that Zeus had ravished Aegina, the daughter of Asopus, but refused to give information to the seeker before he had a spring given him on the Acrocorinthus.