Clear Lake is a natural freshwater lake in Lake County in the U.S. state of California, north of Napa County and San Francisco. It is the largest natural freshwater lake wholly within the state, with 68 square miles (180 km2) of surface area. At an age of 0.5 million years, it is the oldest lake in North America. It is the latest lake to occupy a site with a history of lakes stretching back at least 2,500,000 years.

The Pomo are a Native American people of California. Historical Pomo territory in Northern California was large, bordered by the Pacific Coast to the west, extending inland to Clear Lake, mainly between Cleone and Duncans Point. One small group, the Tceefoka, lived in the vicinity of present-day Stonyford, Colusa County, were they were separated from the majority of Pomo lands by Yuki and Wintuan speakers.