the forest management "Srbijašume". The water was treated by various selected plants, in the process called phytoremediation, and the quality of the water improved from the fifth to the second category, but the technology wasn't pursued any further. Instead, in 2019 and 2020, it was applied at the Lake Trešnja, in the suburb of Ripanj, where it proved to be highly successful in reducing pollutants in the water. After several months of bad smell which spread from the bay, the dredging began in November 2020. Until February 2021, the was removed, thus creating a channel to allow the water to flow out of the bay into the river. The dredged sludge is spread along the central section of the Danube's flow, upstream from the Pančevo Bridge. Instead of revitalization, the bay turned out to be polluted more than ever. By April 2021 the water was classified as the lowest, fifth category. The water was anoxic, full of ammonium-nitrogen and orthophosphates. The red wastewater from the sewage also influenced water's organoleptic qualities – changed color, murkiness, strong smell and visible residues of organic matter, but in May city administration announced it inspected the Topčiderka's watershed, founded the polluting factories and closed them, fixing this problem. Wildlife Plants Ada Ciganlija has a unique ecosystem, creating an oasis in the urban area. Most of the peninsula is forested. The original, thick deciduous forest mainly consists of oaks, elms, birches and willows. In the mid 20th century, further planned forestation of Ada Ciganlija included the planting of Northamerican poplars and green ash. In total, some 450 plant species inhabit Ada, including white poplar, black poplar, white willow, pedunculate oak, narrow-leaved ash, Canadian poplar, European white elm, box elder, American ash. In 2010, total forested area covered , or two thirds of the island. This characteristic of Ada gives its visitors an illusion of being in complete wilderness, aided by the fact that city ambient noise is completely muted by the thick forest. Most of the forest on the island is protected, including the entire central, northern and western sections. These parts of the peninsula are entirely wild with uncultivated vegetation and very little or no human presence, making it unique compared to other European city islands and peninsulas. Part of the Ada's central forested complex was declared a protected habitat "Fungi of Ada Ciganlija" by the city on 29 November 2013. Apart from the