The southeast of Yellowstone Park is the Yellowstone Lake District, with the main scenery of the lake and mountains and rich wildlife. Yellowstone Lake has an area of about 354k ㎡, which is a typical Huokou Lake and is also the "largest alpine lake in the United States". Evergreen trees, such as elms and genuine lizards, are a habitat for many birds and wildlife, and the best place for fishers and boaters. The lake is shaped like a hand, and a thumb-like place on the west side is WestThumb. Looking at Yellowstone Lake at the Western Thumb, you will find the lake on the shore, and the color is constantly changing, which is the sign of the hot fountain at the bottom of the lake. It is difficult to imagine that under this quiet lake is the world's largest ancient crater.