Agios Achillios is a small island in Small (Mikri) Prespa Lake. The name derives from the name of Saint Achilles, bishop of Larisa in the 4th century. The island was both a Roman and a Byzantine settlement and is known for its Byzantine ecclesiastical monuments.

On the island there are about ten houses, a guesthouse and a café/restaurant. It is with an island in Lake Pamvotis, nearby Ioannina, the only inhabited island in a lake in Greece. The main sight on the island is the ruin of the Saint Achilles Basilica (see: www.ipernity.com/doc/294067/47408324). It is said that the island houses water buffalos, but the only animals we saw were some stray cats and ‘normal’ cows.

The Agios Achillios island and the Prespa Lakes (also known as Prespes) are located in Northwest Greece, at the tri-border point of Greece, Albania and FYR Macedonia/Republic of North Macedonia. Agios Achillios is connected to the mainland by a 650 m long floating pedestrian bridge.