Kis-Balaton consists of the former westernmost bay of Lake Balaton, which is located in the River Zala delta. The Site is an extensive marshland in two main parts: Phase I is characterized by open water surfaces with relatively narrow reedbelts along the dikes, while Phase II contains vast reedbeds and sedgy marshes. The Site supports an outstanding biodiversity within the Pannonic biogeographic region. The shallow waters are an important spawning ground for fish, and the marshy meadows and the reed-beds provide breeding and migratory refuge for many threatened species of waterbirds. The aquatic vegetation filters nutrients and plays an important role in sediment trapping. Human activities include controlled reed harvesting, forestry, fishing, and hunting. The Balaton Uplands National Park Directorate organizes guided eco-tours on the strictly protected area of the Kis-Balaton. Potential threats to the Site are posed by illegal fishing, eutrophication caused by the intensive use of artificial fertilizers on the surrounding farmland, and the expansion of the water protection system.