Nagano Prefecture Minami Saku District Usonokuchi Cylindrical Water Division / 長野県南佐久郡 鷽ノ口円形分水 by nabenabe on September 16, 2022January 2, 2023 in Cylindrical Water Division / 円筒分水, Minami Saku District / 南佐久郡, Nagano Prefecture / 長野県