Visovac Lake is situated in Krka National Park and it represents the largest extension of Krka River. In july of 2018 a sampling by line transect method has been applied. Transcets were extended perpendicular to the shore up to the depth at which the macrophytes cease to appear. There have been found 26 species of aquatic plants - one species of yellow-green algae, eight species of chara, two species of moss and one species of vascular plants. The most common species in the flora of Lake Visovac are Myriophyllum verticillatum, Najas marina, Phragmites australis and Potamogeton perfoliatus. There are four main vegetation belts in the aquatic vegetation of Lake Visovac: halophytic vegetation, submerged vegetation with floating leaves, submerged vegetation without floating leaves and chara vegetation. Lake Visovac is dominated by plants of light, warm habitats which survive unfavorable living conditions with their buds in water and which prefer substrates rich in nutrients and neutral Ph value of water, low salinity, evergreen and summer flowering species that are distributed by hydrochory and reproduced by underground stems. The increased inlet of water rich in nutrients and the anchoring effect represent the main threats to the preservation of vegetation of Visovac Lake.