The Lake Plistice National Park is the largest national park in Croatia in the Karst Mountains of central Croatia. It contains many lakes, caves and waterfalls formed by limestone deposits. Because of the 16 connected mountain lakes, the total length of 10 kilometers, the park is also called the 16 Lake National Park. Plitvice Lake group is very similar to China's Jiuzhaigou, so it is often called "Europe Jiuzhaigou" in China. The park covers an area of 19462 hectares, of which forest area accounts for more than 70 [%]. The lake is divided into the upper lake area and the lower lake area according to the topography. Of the 12 lakes in the upper lake area, Kozjak is located at the lowest point in the upper lake area, and is the largest lake in the entire Plitvice Lake area, with cruise ships on the lake. There is a wooden bridge between the lake and the lake, which is convenient for tourists to visit.