Acrocorinth, "Upper Corinth", the acropolis of ancient Corinth, is a monolithic rock overseeing the ancient city of Corinth, Greece. In the estimation of George Forrest, “It is the most impressive of the acropoleis of mainland Greece.”

Corinth was a city-state on the Isthmus of Corinth, the narrow stretch of land that joins the Peloponnese to the mainland of Greece, roughly halfway between Athens and Sparta. The modern city of Corinth is located approximately 5 kilometres northeast of the ancient ruins.

Formerly part of the territory of Cleonae in ancient Argolis, it is today situated in the regional unit of Corinthia. The small village of Archaia Nemea (formerly known as "Koutsoumadi" and then "Iraklion") is immediately southwest of the archaeological site, while the new town of Nemea lies to the west. Here in Greek mythology, Heracles overcame the Nemean Lion of the Lady Hera, and here during Antiquity, the Nemean Games were played, in three sequences, ending about 235 BC, celebrated in the eleven Nemean odes of Pindar.

The Corinth Canal connects the Gulf of Corinth with the Saronic Gulf in the Aegean Sea. It cuts through the narrow Isthmus of Corinth and separates the Peloponnese from the Greek mainland, arguably making the peninsula an island. The canal was dug through the Isthmus at sea level and has no locks.