The roof of the world refers to the Qinghai Tibet Plateau. The Qinghai Tibet Plateau is the largest plateau in China and the highest altitude in the world. It is known as the "roof of the world" and the "third pole". It is also one of the origins of the Chinese nation and one of the birthplaces of Chinese civilization. Most of it is in the Tibet Autonomous Region and Qinghai Province of China, accounting for 23% of the total area of China.
The Qinghai Tibet Plateau starts from the southern edge of the Himalayas in the south to the Kunlun Mountains, Altun Mountains and the northern edge of Qilian Mountains in the north. It is about 2800 kilometers long from east to west and 300 ~ 1500 kilometers wide from north to south, with an average altitude of more than 4000 meters. With a total area of about 2.5 million square kilometers, most of them are located in China, except that the southwest edge belongs to India, Pakistan, Nepal, Sikkim, Bhutan and Myanmar.
The water resources of the Qinghai Tibet Plateau exist in the form of rivers, lakes, glaciers, groundwater and other water bodies, with river runoff as the main body.
The Qinghai Tibet Plateau is a vast region with a long and complex geological history and rich materials formed in various environments. Among the more than 100 kinds of mineral resources that have been discovered, nearly 70 kinds have been proved, including chromium, copper, lead, zinc, crystal, asbestos, salt lake and hydrothermal mineral reserves; The mineral reserves of silver, gold, tin, platinum group elements and rare earth elements are also considerable.