Mornos

thumb|260px|The Mornos reservoir, seen from the northwest The Mornos () is a river in Phocis and Aetolia-Acarnania in Greece. It is long. Its source is in the southwestern part of the Oiti mountains, near the village Mavrolithari, Phocis. It flows towards the south, and enters the Mornos Reservoir near the village Lefkaditi. The dam was completed in 1979. It leaves the reservoir towards the west, near Perivoli. The river continues through a deep, sparsely populated valley, and turns south near Trikorfo. The lower course of the Mornos forms the boundary between Phocis and Aetolia-Acarnania. The Mornos empties into the Gulf of Corinth about 3 km southeast of Nafpaktos.

==Geology of the Mornos rift valley== The Mornos river erodes the Mornos rift valley, which crosses the trough between Parnassos and Pindus geotectonic zones. Those zones are simply mountain chains trending generally NW to SE. They were formed during the Hellenic orogeny, when the mountain zones of Greece were thrust upward in folds due to compression caused by the subduction of the African Plate under the Eurasian Plate. The old subduction zone remains as the Hellenic trench. The zones closest to the subduction are the outer Hellenides, where Hellenides is the geologic term for the mountains of Greece. The inner Hellenides are further east.