Koutavos lagoon is situated in the gulf of Argostoli and has a surface of 13.000m².
The most important swimmer of the lake is the sea turtle Caretta-Caretta.
It has an oval shape with maximum length of approximately 6.5km and minimum of 1.2km. Its depth is very small, up to 1.80m.
It starts from De Bosset bridge, named after the Swiss constructor mechanic De Bosset, officer of the British army.
Koutavos, a significant wetland of Kefalonia, hosts many species of birds like swans, mallards, waterhens, gulls, but also many fish species.