Why are many rivers in Xinjiang and Tibet turquoise blue?

From the perspective of a traveler, in Xinjiang, Tibet, as well as western Sichuan, and some areas of Qinghai and Gansu, because they are on the plateau, many rivers and lakes exhibit an incredible blue. One reason is that the sky is more transparent at high altitudes, and the colors are better. When the weather is clear, the rivers and lakes reflect the sky, and they appear as pure and azure as the sky itself. Another reason is that many rivers and lakes on the plateau are close to snow-capped mountains and glaciers, which is also one of the reasons for the beautiful colors. There is also a reason that these rivers and lakes near snow-capped mountains and glaciers are relatively deep. If the color itself is quite blue, then the deeper the water, the bluer it becomes. For example, the deepest part of Yuhu Lake near the Aheya Glacier Snow Mountain in Zhaosu, Xinjiang, is about 90 meters. The deepest part of Chongba Yongcuo near the Himalayan mountain range glaciers in Kangma, Tibet, is also about 60 meters. Rivers generally flow through many regions, and the natural environment and depth of the water vary, so the color of the same river is different in different regions. The lakes we commonly see in cities are about 20 meters deep at most, and ordinary lakes are only a few meters deep, so there is a difference in water color. This is our intuitive feeling when traveling to different regions and lakes. Picture 1–6 is Yuhu Lake in Zhaosu, Xinjiang Picture 7–9 is Chongba Yongcuo in Kangma, Tibet