Kesen is spoken in the Kesen district, Harutsugu Yamaura developed a writing system for Kesen has been described as a variety of the Thoku dialect which is a group of the Japanese dialects.
Kesen is spoken in the Kesen district of Iwate Prefecture, in the Tohoku 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 Tohoku dialect. The Tohoku dialect (, Tohoku hogen), commonly called  Tohoku-ben, is a group of the Japanese dialects spoken in the Tohoku region, the northeastern region of Honshu. 
