The blue lake was created when two neighboring sinkholes which caved in and merged, giving the lake its kidney-like shape. Sinkholes are formed by erosion of limestone bedrock under the influence of water. Due to limestone's permeability, water gathers underround where it creates caverns. Sinkholes occure when roofs of these caverns collapse due to natural movements, such as earthquakes.
The bed of the blue lake is not always unterwater. The lake dimensions vary depending of the water level, and sometimes it is completely dry.

Plavo jezero je nastalo kada su se dvije susjedne vrtače udubile i spojile, dajući jezeru bubrežast oblik. Vrtače nastaju erozijom vapnenačke podloge pod utjecajem vode. Zbog propusnosti vapnenca, voda se skuplja u podnožju gdje stvara špilje. Vrtače nastaju kada se krovovi ovih špilja uruše zbog prirodnih kretanja, poput potresa.
Korito modrog jezera nije uvijek podvodno. Dimenzije jezera variraju ovisno o vodostaju, a ponekad je i potpuno suho.

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