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 Chinese dialects.
Evidence: Kesen dialect (気仙方言, Kesen hōgen) or Kesen (ケセン語, Kesengo, Kesengo) is a Japanese dialect spoken in Kesen County, Iwate Prefecture, Japan. 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. Yamaura also created an orthography for Kesen using two writing systems, the first based on the Latin script, and the second on the Japanese writing system.