Prompt
Generate an image of a serene river flowing through the heart of Athens, Greece, with a notable presence in ancient history, surrounded by lush greenery and possibly with hints of urban landscape in the background, reflecting its 22 km course from its sources in Parnitha and Penteli mountains to Phaleron Bay, under a clear blue sky with perhaps a few historical or mythological symbols subtly incorporated to signify its significance in Ancient Greek references.