Can be considered a natural 'mythological' monument since it is a river that connects the waters of the Styx, which is strongly connected to greek mythology and supplies the river with water. Originating from Helmos, cools the pretty village of Zarouchla and finally flows into the gulf of Corinth near Akrata. You may walk along the river to admire nature, its clear waters as well as lake Tsivlou which was created by a landslide that cut off the flow of the river.