the , was discovered only on 12 June 2010. Due to its seclusion and inaccessibility in the bend of the Perućac lake, it is inhabited by bears and chamois. The canyon is located on the right side of the Drina, being completely within the national park area. The stream of Selski Potok flows through it for , down the altitude of through some 40 waterfalls, varying from . Over the final waterfall, the Selski Potok flows into the Drina. Plantlife Forests account for three quarters of the national park's area, , some of them being the best preserved and well-kept in Europe. With 83.5% of the territory under forest, Tara is the most forested area of Serbia and thus nicknamed the "lungs of Serbia". The forest growth is among the highest in Europe: the total wood mass increases each year and the quality of the forest is enhanced. Cutting of the wood is strictly controlled. Since 1960, the total measurement of the wood mass on Tara has been measured every 10 years. From 1990 to 2000, the mass grew from to . Within the park, there are 9 reserves with an area of , or 16% of the park, where woodcutting is forbidden. Some of the areas are left unattended for centuries, making them basically a temperate rainforest. Forests mainly consist of beech, spruce and fir. Tara also boasts a rare endemic Tertiary species, the Serbian spruce which is now protected in the small area of the park. It was discovered by Josif Pančić in 1875 in the Zaovine's hamlet of Đurići. Because of its rarity and scientific importance, it has been placed under national protection as it can only be found on two locations on Tara: the canyon of the Mileševka river and on the Zvezda massif. Oldest trees in the park are the beeches, (some are estimated to be over 500 years old) but other old and rare Tertiary species include European holly, Blagaj's daphne and European yew. With several other beech localities in the national parks of Fruška Gora and Kopaonik, beech forests Zvezda and Rača Gorge on Tara have been submitted for the inclusion into the UNESCO World Heritage Site Ancient and Primeval Beech Forests of the Carpathians and Other Regions of Europe in May 2020. The nomination was rejected due to the Serbian laws allowing shelterwood cutting on the area of , while UNESCO accepts