Gambier is an extinct volcano, forming a volcanic lake on the crater. Gambier's original four volcanic lakes, two of which disappeared due to drying, and the Blue Lake's water source consists of rainwater and groundwater, which is vibrant and clean, and becomes the supply of water for locals. There is a large rotating observation deck on the lakeside, which can enjoy the panoramic view of the Blue Lake and the town of Gambier. Walking along the surrounding3.6 kilometers of sightseeing roads, the scenery along the way is also very intoxicating, and it has a special flavor.