California has the best natural mineral hot springs pools, both free and paid. There are resorts, hotels and spas, as well as undeveloped primitive thermal springs perfect for soaking in CA nature.
California Hot Springs Map, 94 Top Soak Spots
Natural Hot Springs Map Project
12 Natural (Free!) Hot Springs in Southern California + Roadtrip
Where to find the best hot springs in California - Los Angeles Times
California Hot Springs Map, 94 Top Soak Spots
NPS Geodiversity Atlas—Hot Springs National Park, Arkansas (U.S.
Map of Calistoga or Little Geysers and the Hot Sulphur Springs, mapa king legacy
Mammoth Lakes California Hot Springs - AllTrips
Hot Springs in Northern California - Complete List
7 California Hot Springs
Feeling frazzled? These soothing hot springs let you unwind
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Map of US Hot Springs and their Temperatures