With respect to 'Kirishita soba,' in the narrow sense, it is a type of it means buckwheat produced in the foggy area where there is a large temperature difference between morning and night in the Togakushi region, buckwheat flour made from the buckwheat, and buckwheat noodles made from buckwheat flour.
「霧下そば」について、狭義では戸隠そばの中でも昼夜の気温差が激しく霧の発生する場所で獲れたソバやそば粉やそれで作った蕎麦だけを指す。