Greece's Lake Koroneia shrinks from 34.4 to 2.7 square kilometres after decade of drought

Shrinkage of Lake Koroneia

Lake Koroneia in northern Greece was previously designated as a protected wetland and ranked as the fifth largest lake in the nation. The lake once served as a sanctuary for thousands of water birds and migratory flocks, including flamingos, while functioning as a key economic asset for local farmers, fishermen, and visiting tourists. Satellite data compiled by the National Observatory of Athens shows that the lake has now shrunk to less than a tenth of its original expanse. The open water has receded into a collection of murky, separated ponds, leaving behind a broad mud basin that is cracked and bleached by continuous sun exposure. Costas Hatzivoulgaridis, the head of the lakeside community of Agios Vassilios, noted the contrast between past conditions and the current environment.

We knew the lake in its good days, with fishermen, with plenty of water, a wonderful park, and beautiful scenes with birds. Today, what we see is a disappointment.

Climatic drivers and reduced rainfall

Researchers track the beginning of the current depletion to the conclusion of a wet weather cycle during the 2015 to 2016 season. Since that period, a decade characterised by low precipitation and elevated regional heat has evaporated the standing lake water as well as the feeder springs that supplied it. Satellite analysis from the National Observatory of Athens indicates that the lake surface dropped from 34.4 square kilometres in 2016 to 2.7 square kilometres. Dimitris Papadimos, the head of water resources management and climate change at the National Wetland Center in Thessaloniki, explained the primary atmospheric causes behind the reduction.

The main factor behind the lake's falling level is certainly annual rainfall in its catchment, which has averaged about 400 millimeters (15.75 inches) over at least the last five years. That is about 150 millimeters less than in previous decades.

Beyond the drop in precipitation, local heating trends have intensified atmospheric demand. Papadimos noted that rising average temperatures in the region have increased evaporation rates by 100 to 150 millimetres each year.

Agricultural demand and regional consequences

The environmental retreat of Lake Koroneia also involves extensive human water usage. With rainfall growing more irregular across northern Greece, agricultural operators have long relied on the lake to supply water for their cattle and crops. In September 2026, a visiting reporter documented a local farmer using a giant pump to extract water directly out of the diminished pools that remain on the lake bed. Local residents and authorities report that this persistent over-irrigation has compounded the deficit caused by the drought.

The conditions at Koroneia reflect broader environmental strains seen across the European continent during the summer of 2026. Heatwaves and dry periods reduced multiple European rivers and lakes to levels unseen in decades, interrupting commercial shipping routes and lowering power station generation output. In northern Greece, the transformation of Lake Koroneia has depleted a vital refuge for migratory avian populations, leaving the remaining wetland divided into isolated ponds.