Zhangfan Hot Spring Resort

　　The hot spring is situated in Zhangfan Village, Wangren Town, with a water temperature of 35.5°C. It is classified as “warm water” within the “low-temperature hot water resource” category based on the geothermal resource temperature grading standard. If measured by the representative temperature of the main heat reservoir, it approaches the “warm-hot water” level. With deep well pumping, the water temperature can reach above 40°C. The natural water level stands 2.5 meters above the ground surface, with a discharge of over 542.5 cubic meters per day. There are five natural springs in the hot spring area, indicating abundant groundwater resources, with a total water yield that can exceed 2,000 cubic meters per day. A major characteristic is the high radon ion content in the spring water, reaching up to 581 Bq/L, which is rare among domestic mineral waters. The water contains a variety of elements beneficial to human health, has a high degree of mineralization, good water quality, no rotten egg smell, and no impurities or turbidity. It does not contain toxic substances, thus offering development potential for medical, tourism, and fishery uses. It is a typical radon spring.