In the southern part of the Attica region, just after Lake Vouliagmeni, you will find the Limanakia. These are essentially small, natural, rocky bays that have been formed along the coastline.
This is a particularly popular choice for Athens residents that flock here on the weekends for a swim in its crystal clear waters.
You can only reach the beach by going down the rocks along a path that leads to it. It is not organized, so get ready to lie your towel on the rocks.