Aerial photo taken on Oct. 15, 2017 shows the trees of populus euphratica on the banks of Tarim River, northwest China's Xinjiang Uygur Autonomous Region. Located in northwest China, Xinjiang Uygur Autonomous Region boasts three mountains, namely Tianshan, Kunlun and Altay, and two basins, Junggar and Tarim. Its various landscapes and natural beauties attract tourists from home and abroad. In recent years, Xinjiang has carried out a number of projects, including natural forest protection, returning farmland to forest or grassland, prevention and control of desertification and wildlife protection, to improve local ecological environment. From Sept. 16 to 18, the "Xinjiang Day" event is held at the ongoing Beijing International Horticultural Exhibition to welcome visitors worldwide. (Photo by Xiao Yulei/Xinhua)