Photo taken on Aug. 5, 2019 shows China's national flag and the flag of the Hong Kong Special Administrative Region (SAR) on the Golden Bauhinia Square in Hong Kong, south China. Known as the "Pearl of the Orient", Hong Kong has a land area of more than 1,100 square kilometers. The metropolis boasts not only its well-known architectural landmarks but also beautiful natural landscapes. Various landforms offer habitats for animals and plants in the city. And Hong Kong has put efforts on ecological protection for years to achieve sustainable development. The Beijing International Horticultural Exhibition holds the "Hong Kong Day" event from Sept. 19 to 21. (Xinhua/Wu Xiaochu)