Corinth was one of the few Greek cities with two ports, Lechaion in the Corinthian Gulf and Kenchrees in the Saronic. The two ports were named after the sons, Lechis and Kenchrias, of Poseidon and Pirene, daughter of the river God Acheloos.
Lechaion was on the western seaport city of Corinth and the most significant port because it was very close to the city, only two stadiums away. The Corinthians had designed long walls linking the fortified city to the port and to the war naval dockyard. Since 1892, during the excavation process, foundations of the long walls and more specifically the western wall have been found
The port of Lechaion was used during the prehistoric times until the late antiquity. Today it is 1 km west of the new city of Corinth and occupies an area of 50 hectares. This area, was once a marsh, was formatted during the Bacchides period (6th century B.C.) while there was also a second construction phase in the Roman Times (1st century A.D.). Furthermore, breakwaters were constructed, jetties, outer ports, dry docks, ship sheds, 7km long piers and two entrance channels that connected the port to the sea. The materials from the excavation were accumulated, forming fortification hills 18-20 m high, to protect the ships from the northern winds blowing in the Corinthian Gulf.
The Corinthians increased its security and capacity by building technical work that present the port as a technical achievement. The first technical work seems to have been constructed in the early archaic Times, when the need for a western port was even bigger, in order to service the colonial campaign of the Corinthians into the West. The port during the Roman Times included jetties made of massive rectangular limestone.
The port was extended in two parts, the interior and the exterior port. The interior had a quay, and there were also a temple and statue of Poseidon and Aphrodite and other harbor facilities. The Macedonians and the Romans used the port as a military dockyard, and until Roman Rule, Lechaion experienced an amazing growth and had impressive buildings, commercial centers, mansions and many statues. Leonidis, an early Christian Basilica, the biggest basilica in the Helladic area, built in the late 5th century A.D., shows and verifies the great importance of the port also during early Christianity.
Today, a lagoon indicates the location of the Lechaion port.