Epidaurus was a small city (polis) in ancient Greece, on the Argolid Peninsula at the Saronic Gulf. Two modern towns bear the name Epidavros: Palaia Epidavros and Nea Epidavros. Since 2010 they belong to the new municipality of Epidaurus, part of the regional unit of Argolis. The seat of the municipality is the town Lygourio. The nearby sanctuary and ancient theatre were inscribed on the UNESCO World Heritage List in 1988 because of their exemplary architecture and importance in the development and spread of healing sanctuaries and cults across the ancient Greek and Roman worlds.

The Saronic Gulf or Gulf of Aegina in Greece is formed between the peninsulas of Attica and Argolis and forms part of the Aegean Sea. It defines the eastern side of the isthmus of Corinth, being the eastern terminus of the Corinth Canal, which cuts across the isthmus. The Saronic Islands in the gulf have played a pivotal role in the history of Greece, with the largest, Salamis being the location of a significant naval battle in the Greco-Persian wars. The Megara Gulf makes up the northern end of the Saronic Gulf.