Nadja Zupan Hajna re-elected to the UIS Bureau

At the 19th International Congress of Speleology of the International Union of Speleology (UIS), held in Brazil, Dr. Nadja Zupan Hajna from the Karst Research Institute ZRC SAZU was re-elected to the UIS Bureau – this time as Treasurer for the 2025–2029 term. Her presidency (2022–2025) was marked by one of the most important initiatives in the history of UIS – the effort to establish the UNESCO International Day of Caves and Karst (IDCK), which will be celebrated for the first time on 13 September 2025. Dr. Bojan Otoničar and Dr. Nadja Zupan Hajna from the Institute participated in the congress with presentations.