Lake Kerkini
Macedonia, Greece
Lake Kerkini (Limni Kerkini) is an artificial reservoir in Central Macedonia, Greece that was created in 1932, and then redeveloped in 1980, on the site of what was previously an extremely extensive marshland. Lake Kerkini is now one of the premier birdwatching sites in Greece, as it is situated along the migratory flyway for birds en route to the Aegean Sea, the Balkan region, the Black Sea, the Hungarian steppes and beyond.
Reservoir data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).