The lake was formed overnight in 1912 when a catastrophic landslide buried a nearby village and dammed the river.
Tree trunks from the original forest submerged over a century ago are still visible beneath the water surface in clear conditions.
The lake functions as a micro-climate regulator for the surrounding forested valley.
It remains one of the few natural lakes in the Peloponnese region.
The water depth varies significantly, creating distinct light-refraction zones that give the lake its shifting blue-green appearance.
Limni Tsivlou is a high-altitude alpine lake located at an elevation of approximately 800 meters within the Achaea region of the Peloponnese. It was created in 1912 following a massive landslide on Mount Helmos that blocked the Krathis River, submerging a forest valley. The lake is characterized by its deep blue-green waters, fed primarily by groundwater and mountain runoff. The surrounding slopes are densely populated with pine, fir, and plane trees. It covers an area of roughly 80,000 square meters with a maximum depth reaching approximately 80 meters. The ecosystem supports various bird species and amphibians, functioning as a vital local wetland. It is recognized as part of the Natura 2000 network due to its environmental significance. The lake's surface level fluctuates seasonally depending on rainfall and snowmelt from the peaks of Mount Helmos.
The eastern shore provides a panoramic view of the water reflecting the surrounding forested slopes.
Bring a windbreaker or light jacket as temperatures at this elevation are cooler than at sea level.
Ensure your footwear is suitable for uneven, rocky, or muddy lakeside paths.
The road leading to the lake is winding and narrow; drive cautiously.
Attempting to swim in the lake, as the water temperatures remain very cold and submerged debris can be dangerous.
Practice leave-no-trace principles; do not disturb the local wildlife or leave litter in this protected ecosystem.
