The document summarizes three national parks in Bulgaria: Rila National Park, Pirin National Park, and Central Balkan National Park. Rila National Park covers 81,046 hectares and contains four nature reserves. Pirin National Park covers 40,332.4 hectares and also has four reserves. Central Balkan National Park is the largest at 71,669.5 hectares with nine reserves within its boundaries. All three parks contain important geographic features like mountains, forests, lakes, and waterfalls.