The boundary in this map has been tampered. Lake Gistova and the area around it has been sliced from Greek sovereignty and placed inside Albanian jurisdiction. The also have tampered with the Google Map as well. It is an issue that has started currently with some cycles from Albania that are removing the border pyramids. Please check Sentinel 2 map which is European and an official EU one if you have any doubts on this matter.  
https://browser.dataspace.copernicus.eu/?zoom=16&lat=40.36496&lng=20.79214&themeId=DEFAULT-THEME&visualizationUrl=U2FsdGVkX19BtvFoPcTS2mMlFNfsqnwBagkI0QqM2vGK78hW5vXvJ0DEs2waLuXn0Si%2FUSAdxbBecuR8848MG9qx45U6FkiJnwHKh9lHomv2Xij7VBIEkVfFdcNvR7Wh&datasetId=S2_L2A_CDAS&demSource3D=%22MAPZEN%22&cloudCoverage=30&dateMode=SINGLE
Here is also the official site of the Greek government of Greece about Lake Gistova or Drakolimni. 
https://www.visitgreece.gr/inspirations/dragon-lakes/
I am looking forward for a solution on this matter.  Thank you for your attention, NM

