Plitvice Lakes National Park, Croatia's largest national park covering almost 30,000 hectares, is situated in the lower elevations of the Dinarides in the central part of the country. Within a beautiful karst landscape dominated by a mix of forests and meadows, the magnificent Plitvice lake system stands out, fascinating scientists and visitors alike. Interconnected by many waterfalls and watercourses above and below ground, the lakes are grouped into the upper and lower lakes. The former are formed on dolomites, with mild relief, not so steep shores and enclosed by thick forests, whereas the latter, smaller and shallower, are situated in limestone canyon with partially steep shores. The lake system is the result of millennia of ongoing geological and biochemical processes creating natural dams known as tufa barriers.