The Wappo are a small group within the Yukian family located in Northern California, distinguished from the Huchnom by Pomo territory. Their traditional lands are primarily in the mountainous regions between Sonoma, Lake, and Napa Counties, specifically around Geysers and Calistoga. Additionally, a segment of the Wappo, referred to as Rincons, inhabited the Russian River valley near Healdsburg.
The Wappo people, named from the Spanish term for “brave,” were known for their resistance to Spanish military actions. They spoke a unique language within the Yukian family. Historically located in the Napa River headwaters and surrounding areas, the Wappo comprised various subdivisions and villages, with notable settlements at St. Helena and Yountville. An estimated 1,000 Wappo existed in 1770, but their population dwindled significantly by 1910, with only 73 recorded.