The Trefoil, Glacial lake in Rila Mountains, Bulgaria
The Trefoil Lake sits at 2216 meters (7270 feet) in the Rila Mountains and takes its name from its distinctive shape with three separate sections. Steep mountain walls surround the water, forming the valley where the lake rests.
The lake basin was carved out millions of years ago by melting glaciers that dug deep depressions into the rock. These masses of ice persisted over long periods and left behind the landform we see today.
The lake is part of a system of seven mountain lakes that form a well-known destination for hikers and mountain enthusiasts. The area attracts people who value high-altitude landscapes and the quiet of the mountains.
The lake is reached via hiking trails from a nearby mountain lift, though the route presents demanding conditions. Visitors should bring sturdy footwear, warm layers, and mountain gear, as weather at this elevation can change rapidly.
The water remains frozen between October and June, with ice thickness reaching up to two meters during harsh winters. This long freeze period shapes how the place looks and is accessible throughout the year.
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