Blue Lake, Karst lake in Imotski, Croatia.
Blue Lake is a karst lake nestled in a deep limestone sinkhole that extends roughly 220 meters from the upper rim to the bottom. The water fills this natural basin, with depths that shift according to the season.
The lake formed through natural geological processes typical of karst landscapes, but was altered by an earthquake in 1942. A major rockfall from that event permanently lowered the lake bed.
The lake serves as a gathering place where locals come together, especially when the water vanishes in summer. During these dry periods, the community uses the exposed basin for football matches and public events that bring the valley to life.
A paved path descends from the top to the water's edge and allows for swimming when water levels are high enough. The best time to visit is spring, when the water volume is at its peak.
Water levels swing dramatically between 90 meters deep in spring and completely dry in late summer, transforming the basin entirely. This extreme fluctuation means each visit feels different depending on when you arrive.
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