First of all, the navigation guide is wrong. The place is a temple-like place. You don't have to go to the small slope on the navigation at all. Go directly along the road. When you arrive at the Geological Museum, you can see this blue lake. So happy, the tickets are free. I heard that there is 40 meters of deep water. It is a place to test the diving certificate. After coming, it feels worth it. After all, it's free, it's really great. There is also a museum next to it, so you can understand the geology around, which is really good.