It is part of the municipal unit Oichalia in Messenia .
Agios Sostis is a small village located at the borders of Arcadia , Elis and Messenia regional units , in southern Greece .
Agios Sostis is part of the municipal unit Oichalia in Messenia .
Agios Sostis is a small village located at the borders of Arcadia , Elis and Messenia regional units , in southern Greece .