In classical Greece, Lerna was a region of springs and a former lake located in the municipality of the same name, near the east coast of the Peloponnesus, south of Argos. Even though much of the area is marshy, Lerna is located on a geographically narrow point between mountains and the sea, along an ancient route from the Argolid to the southern Peloponnese; this location may have resulted in the importance of the settlement.

Argos is a city and former municipality in Argolis, Peloponnese, Greece and is one of the oldest continuously inhabited cities in the world, and one of the oldest in Europe. It is the largest city in Argolis and a major center in the same prefecture, having nearly twice the population of the prefectural capital, Nafplio.