The groundwater of Kumamoto, Japan is known as "miracle water" due to its high quality and mineral content. It flows naturally from Mt. Aso through Kumamoto city, having been purified through the power of nature. Kumamoto is nicknamed the "Capital of Water" as most cities in Japan do not use groundwater, but Kumamoto's water has a very good taste due to beneficial minerals. The document encourages protecting and appreciating Kumamoto's groundwater, which provides healthy living and is a treasure.