Two lake-springs, where water jets throughout the year from the bottom, in significant quantity. The Makaria spring streams in the northwest of the National Park, preserving two freshwater and brackish water lakes. The lakes have aquatic and riparian vegetation with reeds. Eels, turtles and a small endemic fish live in them, common known as “Attikopsaro” whose scientific name is Pelasgus marathonicus. The natural flow of the spring has now been restored and today the bulk water flows to the wetland through the rowing center. Rains plays a major role also. The artificial channel, draining formerly all of the spring water to the sea, is pumped for ecological water provisions, to maintain the vegetation that has grown, e.g. the aquatic plants in the surface of the water and the algae of the genus Chara in the bottom of the channel.