Lake Trichonida (Greek: Λίμνη Τριχωνίδα - Limni Trichonida, Ancient Greek: Λίμην Τριχωνίς - limen Trichonis) is the largest natural lake in Greece. It is situated in the eastern part of Aetolia-Acarnania, southeast of the city of Agrinio and northwest of Nafpaktos.