The Agios Achillios island is situated in the heart of Mikri Prespa lake and can be reached on foot by a long wooden bridge or by boat.
This is where Tsar Samuel of Bulgaria built a magnificent basilica especially for the mummified remains of Saint Achillios, an early bishop of Larissa in Thessaly, when he conquered that city in the 10th century.
Today this romantic ruin is the most important site in Prespa lakes.
