This is a satellite view of Tibet plateau. Tibet is called roof of the world because it is about 5000 meters higher than its surroundings.
Indo-Ganges basin below it is green and firtile because Himalayas and Karakorams on plateau's south get a lot of rain and snow from monsoon in summer and mediterranean winds in winter.
Sandy Taklamakan desert in Chinese Turkestan (Xinjiang ),north of Tibet is gets very little rain. some Tibetan rivers drain towards north to support populations of old cities like Kashghar, Yarkand and Khotan.
Eastern part of Tibet is the origin of few largest rivers on earth, that support the life in China, South east Asia and South Asia.
Rivers from western Tibet reach pakistan and centeral Asia.
You can see many lakes in the middle of Tibet. It shows that this area didn't get rains necessary to make rivers long enough to reach the sea.
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