The church of Panagia Katonissiotissa (Assumption of Mary ) has given her name to the beautiful nearby beach (Kato nisi) and to the small islets that surround it (the islands of Panagia). The church was built on a hill in the ruins – according to local testimonies – of an old Byzantine temple in about 1895. Materials and stones were used by the old Byzantine temple. In the interior of the sanctuary there are also still old hagiographies. Around the church there are indications of Mycenaean civilization (tombs and other findings). They say that the church in antiquity was the temple of Athena. Next to the church there is also a small cemetery. Take a look at the old inscription on the south side of the church.
The access is easy and can be done from the road that is next to the beach. You can find the church southern from the beach.
source: elafonisos.gov.gr