Hot springs near San Francisco cluster in the Napa and Sonoma valleys, following two corridors north from the city: US-101 to the Sonoma Valley and CA-29 through the Napa Valley to Calistoga. The Fairmont Sonoma Mission Inn, about 45 miles north, draws mineral water from a source 1,100 feet underground.
Calistoga, approximately 75 miles from downtown, has been a spa town since the 1860s. Indian Springs, Solage, Roman Spa, and Dr. Wilkinson's all operate within walking distance of each other near Lincoln Avenue, fed by volcanic activity beneath Mount St. Helena. Thirty minutes north of Calistoga, Harbin Hot Springs near Middletown in Lake County is a clothing-optional retreat center on 1,700 acres with warm and hot mineral pools, roughly 90 miles from the city via CA-29 and CA-175.
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