Otliško okno (the window of Otlica) is a remarkable karst feature and a natural sight of Slovenia. The 'window' is actually a natural stone bridge.
The settlement Otlica derives its name from it (votel - 'otel; the place nearby the hollow mountain). The window was created on the location of a previous sinkhole when water found its way through the rock, widening the crack into the huge window of its present shape. Just below the main 'window', there is another smaller one.