Baotu Spring, located in Jinan, Shandong, China, is a culturally significant artesian karst spring renowned for its historical and natural beauty. Known as the "Number One Spring under the Heaven," it was highly praised by the Qianlong Emperor during the Qing dynasty. The spring maintains a constant temperature of 18 degrees Celsius year-round and is part of a group of springs that contribute to the area's reputation as the "City of Springs." Baotu Spring's history dates back over 3,500 years, making it a site of both natural wonder and profound cultural heritage.