The landscape of Lake Mornos has changed noticeably in recent months, as heavy rainfall during this winter and last April led to a significant rise in water levels, causing the village of Kallio to gradually disappear again beneath the surface of the lake.

It is recalled that last year the picture was completely different, as the submerged village of Kallio was increasingly re-emerging due to the drop in water levels.

The history of the village is directly linked to the water supply of Attica (Athens region). In the early 1980s, residents abandoned the settlement so that the major Mornos Dam project could be completed, which to this day remains one of the most important sources of water supply for Athens.

(2025)

Data on the Mornos reservoir’s condition

Recent data shows a clear strengthening of reserves. According to figures from EYDAP, on April 6, 2026 the lake’s water volume stood at 487,261,000 cubic meters, while one month later, on May 6, 2026, it reached 525,585,000 cubic meters. Within a month, a significant increase was recorded, attributed to continuous spring rainfall.

The difference becomes even more evident in comparison with last year, as during the same period in 2025 reserves had dropped to 319,832,000 cubic meters, raising strong concerns about water adequacy in Attica.

The significant recovery of water levels in Lake Mornos is also reflected in photographs by Antonis Nikolopoulos from the Eurokinissi agency, which capture the new image of the reservoir after the heavy rainfall of recent months.