Knights Valley is the warmest appellation in Sonoma County. It is situated between Alexander Valley and Chalk Hill, and borders Calistoga in the Napa Valley.
Originally carved by the Russian River, the volcanic activity and the eruption of Mount St. Helena turned the river west and raised Knights Valley floor. The rocks that form Mount St. Helena are known as the Sonoma Volcanics and the eruptions that formed these rocks are estimated to have been between 2.6 and 8 million years ago.
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