KARST · WATER · COLLAPSE
The landscape
beneath the landscape.
To understand Imotski, it helps to stop thinking of rivers and lakes as only surface features. In karst country, water moves through cracks, cavities, springs and underground passages inside soluble limestone.
What is karst?
Karst develops where water slowly dissolves soluble rock, especially limestone. Over very long periods, this can create underground drainage networks, caves, sinkholes and large depressions. Imotski is a spectacular expression of that process.
Collapse and water
Red Lake is described by UNESCO as the result of the collapse of a massive doline. Blue Lake is another enormous karst depression, but its hydrology is visibly more seasonal. Visit Imota notes that openings at the bottom can behave as springs during wet periods and drains during dry ones.
Why the lakes feel impossible
Their scale is unusual because vertical depth and open sky are experienced together. The visitor looks down into landforms that reveal both the surface and, indirectly, the underground systems that shaped them.