Jiao Lake is also called Dragon Pond. It is located in Zhangjia Bay which is 5km away from Swan Cave Group Scenic Area. Jiao Lake is oval with clear water. It covers an area of 18mu, but it is 103m deep that it is the deepest natural inland lake in Fujian Province and it is the rare geologic wonders at home. The water of the lake is so clear that can see fishes swimming. Around the lake, there are many aquatic weeds and old trees. The village beside the lake is the hometown of Huang Chen who is the painter of Qing Dynasty.