10 Mysterious Places on Earth Where Water Vanishes

7. The Enigmatic Journey of the Unac River: A Subterranean Marvel

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Bosnia’s Unac River flows through limestone canyons, then slips underground for miles before reappearing inside Una National Park. This disappearing act complicates water management and creates rich habitats where surface and groundwater mingle. Scientists use the Unac as a natural laboratory to unravel how sinking rivers recharge aquifers and sustain biodiversity in karst systems.