Kis-Balaton is located in the River Zala delta where it flows into the westernmost end of Lake Balaton. To maintain the water quality in Lake Balaton following historic water level modifications, the Kis-Balaton Water Protection System was created. 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 Pannonian biogeographic region; the shallow waters are an important spawning ground for fish, and the marshy meadows and the reedbeds provide breeding and migratory refuge for waterbirds. The aquatic vegetation filters nutrients and plays an important role in sediment trapping. Human activities include controlled reed harvesting, forestry, fishing and hunting, as well as limited guided tourism. 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 and the continuing construction of the Water Protection System.