Why Lin 'an is called a hot spring town?

the hot spring industry is developed. Lin 'an Tuankou Hot Spring Town is located in the southwest mountainous area of Lin 'an, Hangzhou. It is a basin surrounded by mountains on all sides. There are four streams, namely Turbulent Source, Tangxi, Shenxi and Liangxi, which meet in the basin and then flow into Changhua River. The geographical position is superior and the hot spring industry is developed. It has a unique pattern of "mountain spring city", which has been a treasure land of "surrounded by eight mountains and four rivers converging" since ancient times, and is known as the "four rivers falling into a bright hall".