The magnificent Mount Aso
is an excellent source of natural groundwater.
Influenced by the natural environment of Aso, accumulation of rainwater in the crater over a prolonged period of two hundred years has led to an abundance of mineral-rich water spewing from underground — truly nature’s gift to Kyushu.

Pure water is an indispensable ingredient in the making of quality soy sauce. Consisting of over 1,000 natural springs, Kumamoto is one of the few ‘water cities’ of Japan. Kumamoto Soy Sauce manufacturing would not have achieved its flourishing reputation today if not for Mount Aso’s mineral-rich, carbonic acid water that has been greatly nourished by the hands of time.