The district of Mladenovac includes the mountain Kosmaj, which is, at 628 m of altitude, the second highest mountain in the territory occupied by Belgrade (the highest one is Avala). Mt. Kosmaj is under state protection as a natural reserve and a landscape of exceptional features. Besides Kosmaj, Selters Spa, with its highly mineralized hot waters (reaching 50 °C) and the thermal-mineral springs of Koraćica Spa take up large portions of the Mladenovac area. The lakes Markovačko and Rabrovačko provide a scenery for enjoying the abundance of flora and fauna while listening to the relaxing sounds of water.