Gu'an County, Hebei Province  河北固安

Located in Langfang City of Hebei Province, Gu'an County is known as the "First City South of Beijing", only 50 kilometers away from Beijing's Tian'anmen Square. Gu'an is said to have the best development potential of any geothermal-rich field in North China. The core hot spring area lies in Niutuo Town, with its clear, yellowish thermal water (50℃- 88℃) rich in fluorine and metasilicic acid. The geothermal reservation totals 7.6 billion cubic meters.

The county boasts many spa holiday villages and resorts, the most famous of which is the Huayu Spa Resort at Niutuo Town. The resort boasts two hot-spring swimming pools and about 90 indoor and outdoor spa pools with different therapeutic effects. The beautiful landscape and unique spa culture have attracted many tourists who love simply lying back and luxuriating in the year-round warm water while sipping tea made with the slightly-sweet spring water.