The capital of the Municipality of Saronikos, Kalyvia (Thorikou), is located at the southern end of the large plain of Mesogeia, Attica, home of the Municipality of Prospalta, during ancient times. There have been records of human settlements since ancient years, while there is evidence of significant settlements and development of the area during the early Christian years, the Byzantine years and the Frankokratia. It is bordered by the Municipality of Lavreotiki and Keratea to the east, the Municipality of Kropia to the west, and the Municipality of Markopoulo to the north. Kalyvia was once part of the administrative unit of the Municipality of Thorikia, with administrative headquarters in Keratea. In the 1896 census, Kalyvia was the second largest settlement of the Municipality of Thorikia (following Keratea) with a population of 1,037 residents. The total population of Kalyvia currently is 15,000 residents. The number of significant archaeological findings that have been located in the area of Kalyvia, from all archaeological periods, proves that early settlements in the area date back to the neolithic age.
Findings from that period have been discovered at Lykouriza, from the Bronze age at Foinikia, the Mycenaean period at Trapouria and Olympos, and the majestic Early Christian Basilica of Olympos. From the geometric period, a geometric cemetery has been found at Valomandra, a “summit temple” on Mount Paneio, a potential settlement at Valma and a rich cemetery at Agios Panteleimonas. The Archaic period has also “honored” Kalyvia with exceptional works of art, the memorial Kouros statues. A historic reality that can also characterize our land as the “Land of Kouros statues”. 

Lagonissi is the most renowned coastal settlement of Kalyvia. A renowned tourist resort in the South that follows the coastline of the Saronic gulf up to Saronida.

Olive trees, vineyards and pistachio trees are the main crops of Kalyvia that, along with livestock farming, industry and tourism, are the main local economic activities. 

The byzantine temples of Taxiarches (Archangels), Panagia Mesosporitissa and Saint Peter at the medieval site of the “9 Towers” on the outskirts of Kalyvia, are some of the greatest artistic landmarks of those times. The hiking trails in the wider area, the paths on Mount Paneio, the traditional architecture of the houses in Mesogeia and the culinary feast at the “Greek capital city of meat”, complete the image of a place that carries both intangible and tangible cultural heritage in an absolute balance.