Claim: Kesen is spoken in the Kesen district, Harutsugu Yamaura developed a writing system for Kesen has been described as a variety of the Tōhoku dialect which is a group of the Japanese dialects.
Evidence: Kesen is spoken in the Kesen district of Iwate Prefecture, in the Tōhoku region of eastern Japan. Harutsugu Yamaura, who developed a writing system for Kesen in 1986 (see below), has argued that the form is a language. Kesen dialect has been described as a variety of the Tōhoku dialect. The Tōhoku dialect (東北方言, Tōhoku hōgen), commonly called 東北弁 Tōhoku-ben, is a group of the Japanese dialects spoken in the Tōhoku region, the northeastern region of Honshū.