Like mirror water, reflecting the surrounding snow peaks and deep forests, the virtual reality is difficult to distinguish between the two. Compared with other lakes, the most special place should be regarded as the surrounding mountains, because the altitude is high, the snow on the mountain has not melted until the end of May, and the mountain still looks white. The high sulfur content of the stones in Yellowstone Park makes the water in Yellowstone Lake and Yellowstone River look very clear, but cannot drink and swim.