The Kotychi lagoon is located in the Prefecture of Ilia, NE of the Lechena town while the coastal forest, the Strofylia wetland, is further north, in the Prefecture of Achaia. It is essentially a network of lagoons, lakes, swamps and forests along the northwest coast of the Peloponnese.
The Kotychi lagoon has shallow waters (30-40 cm) and fresh water. It is surrounded by reeds on the land front, while on the sea front it is surrounded by an elongated sandy islet, in the center of which the pipeline that connected the lagoon to the sea. It covers an area of about 8.000 acres and is the largest in the Peloponnese. It is characterized by great biodiversity; its fauna is of prime ecological interest, as the lagoon is at the southwestern end of the western migratory corridor of many migratory birds.