Behind the beach sands and gravels on the shores of the Corinthian Gulf, the plain is formed by recent sediments brought by swift-flowing rivers such as the Xerias and Solomos (or Xeropotamos, the ancient Leukon
), which flow perpendicular to the coast in narrow channels cut in response to regional uplift.
840, Frogs 570, Eupolis Marikas passim, Eupolis 252, Hermippos Artopolides passim, Kratinos 209, 283, Leukon
1, Platon Hyperbolos passim, Polyzelos 5, Adesp.
Oneion to the west, following the course of the Xeropotamos (Leukon
) River or traversing the valleys of the Longopotamos (Rachiani) and Nemea (Koutsomadiotikos) rivers farther to the west.