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is an unincorporated, rural, census-designated place (CDP) in Del Norte County, California, situated on the mouth of the Klamath River. The population was 651 at the 2000 census. Klamath is at an elevation of 30 feet (9 m).
According to the United States Census Bureau, the CDP has a total area of 12.5 square miles (32.5 km²), all of it land.