The Borax Lake Site, also known as the Borax Lake—Hodges Archaeological Site and designated by the Smithsonian trinomial CA-LAK-36, is a prehistoric archaeological site near Clearlake, California. The site, a deeply stratified former lakeshore, contains evidence of the earliest known period of human habitation in what is now California, dating back 12,000 years. A portion of the site, designated a National Historic Landmark in 2006, is owned and preserved by the Archaeological Conservancy.