Atsepar, also spelled Otsepor [1] is a former Yurok settlement in Humboldt County, California. [2] Kroeber maps it on the Klamath River south of the confluence of Bluff Creek and the Klamath, but above the confluence with the Trinity River. [1] Waterman placed it on the Klamath, 1/2 mile south of the mouth of Bluff creek. [3]