English: The Taklamakan Desert in northwest China is a vast region of sand desert sitting in a depression between two high, rugged mountain ranges. Seen in this true-color MODIS image from October 27, 2001, the Taklimakan's rolling sand dunes stretch out over several hundred thousand square miles in the Xinjiang region of China. The desert is hemmed in to the north by the snow-covered Tien Shan Mountain range and to the south by the rugged Kunlun Mountains. At the lower left corner of the image is the Karakoram Mountain range, where the world's second highest mountain, K2, casts a blue shadow (see high-resolution image for an up-close look). Desertification and shifting sand dunes are a major concern for the farmers and herders who live at the Taklimakan's edge. At the bottom of the image lies the Tibetan Plateau.