With a surface area of 594 sq. km Lake Balaton is among the largest freshwater bodies in Central Europe. Lake Balaton is a shallow lake - its average depth is 3.2 m. As a result of continued efforts in environmental protection and nature conservation a rich species diversity has been preserved. A large number of rare and protected plant species can be found in the area, as well as strictly protected and rare animal species. There are 41 indigenous species of fish living in Lake Balaton and its tributaries.
Problems of anthropogenic origin include eutrophication and other water quality issues, introduction of foreign, potentially invasive species, loss of natural habitat in the littoral zone due to concrete shore protection measures, erosion and soil contamination in the watershed.