The geography of Tibet is very unique. The north lies at high plateau surrounded by the serial mountain ranges of Mt. Nyainqentanglha, Karakoram Mountains and Gangdise and the Himalaya range through the south. There are various landscapes composed of basins, plains, canyons, valleys, lakes, rivers and glaciers form in the low areas of Tibet. Tibet is considered to be the headstream of many large rivers such as China's Yangtze, yellow River, Yarlung Tsangpo River (Brahmaputra), Jinsha River, Nu River (Salween) and Lancang River (Mekong) and India's Indus and Ganges. There are over 1500 lakes sprinkled over Tibet, which has made the highest lake density hometown of lakes.