Thyni beach in Koilada, Argolis
A really peaceful sandy beach, with no crowds, no canteens and umbrellas, 10 minutes after the fishing village Koilada. It is the deserted location with few holiday homes around but also the fact that there are other nice beaches near the village so most people don't choose it because of the distance.
If you choose it, it will compensate you with its quietness, its sunset, the wonderful waters and the seabed for exploration. It owes its name apparently to the small sand dunes that used to exist, I don't know if they exist anymore.