Đerdap National Park () stretches along the right bank of the Danube River from the Golubac Fortress () to the dam near Novi Sip, Serbia. It was established in 1974 and spreads on . The park management office is in the town of Donji Milanovac on the Danube. Across the river is the Parcul Natural Porțile de Fier in Romania. In July 2020 the wider area of the national park was designated as the UNESCO global geopark, as the first protected area from Serbia labeled that way. Apart from the Iron Gates Gorge, the geopark includes parts of the Miroč and Kučaj mountain massifs, with total area of . Geography The main feature and attraction of Đerdap National Park's natural beauty is the Đerdap gorge - the famous Iron Gate - the grandiose gateway through the southern slopes of the Carpathian mountains where the longest and biggest river accumulation in former Yugoslavia is located. The Đerdap gorge, which is some long (from Golubac to Tekija), is actually a compound river valley made up of four gorges (Gornja klisura, Gospođin vir, Veliki and Mali kazan and Sipska klisura), separated from each other by ravines. In Gospođin vir, one of the greatest river depths in the world has been measured (). The cliffs of the canyon in Kazan are about high while the riverbed in this part is narrowed down to . The terrain is mountainous (Miroč mountain) with numerous caves, pits, gorges, depressions, springs (karstic spring of Blederija on Miroč) and lakes. There are several excellent natural scenic viewpoints, like the Veliki štrbac and Mali štrbac on the Miroč, above the Kazan gorge. Panoramic view includes mountains of Deli Jovan and Veliki Krš in Serbia and the Carpathians in Romania. Viewpoint Greben was named by Jovan Žujović as the "most beautiful hill in the Balkans" at the 1900 Geology congress in Budapest. Another popular feature above the Danube is the hill of Kapetan Mišin breg. The Đerdap is the longest breakthrough type gorge in Europe. Blederija The Blederija river springs from two karstic springs at an altitude of , under the Topla Bara peak. The springs are away from each other and one has a water temperature around , while the other has a constant . The river forms several cascades in the heavily forested area before creating the Blederija waterfall, tall. The average discharge varies greatly and during the catastrophic