Located in the western central Greece, on the north shore of the Gulf of Patras.
It was several times under siege by the Turks in the wars of 1822 to 1826 and it was here that the British poet Byron died.
Messolongi wetland is an important breeding ground for the endangered Dalmatian pelican. In 1993 the wetlands were under threat from an irrigation plan to divert the River Acheloos.