The document discusses the waters and rivers of the region of Aitoloakarnania in Greece, including the Acheloos River which gives its name to ancient cities along its banks. It also mentions the Evinos River, named after a king who drowned in its waters, and protected natural areas in the region like the National Park of the Lagoons of Mesolonghi - Aitoliko along the Acheloos and Evinos rivers that are home to various bird species.