The Island of St. Achillius is at The small Prespa lake ! The two Prespa lakes, big & small are the highest Tectonic lakes in the Balkans standing at altitude of 853m
The small Prespa lake is shared between Greece and Albania and has a total surface of about 230 km2
On the Island Tsar Samuil of Bulgaria has built on the 10th century a fortress and the church of St. Achillius!
The photograph illustrates remnants of this Church