"There is no lake anymore"
The place has gone or never existed. A user of Organic Maps application has reported that the POI was visible on the map (see snapshot date below), but was not found on the ground.
OSM snapshot date: 2025-05-11T16:17:16Z
POI name: Λίμνη Άλσους Γαρίτσας
POI types: natural-water-lake
#organicmaps android

Auf der Hauptstraße ist im kompletten Ort 30, wegen Lärmschutz.

via StreetComplete 57.1