熊野清水, Spring park in Chonan, Chiba Prefecture, Japan

Kumano Shimizu is a natural spring park in Chonan featuring walking paths and stone channels where clear water from the spring flows. The grounds include resting areas and planted spaces that guide visitors through the site and offer views of the water source.

Legend credits the monk Kukai with calling forth the spring to help farmers during a drought, earning it the name Kobo no Reisui. In the Muromachi period the site belonged to Tsurugaoka Hachimangu, and the shrine diary Tsurugaoka Kojitsu Nikki records it as a bathing retreat run directly by the shrine. In 1985 it was chosen for the Meisui Hyakusen, the only such site in Chiba Prefecture.

The name "Yuya" is thought to derive from the Kumano (Yuya) Shrine standing above the spring, whose name was read in the Sino-Japanese manner; another theory links it to the old place-name "Yuya-men". The shrine is also called Yuya Gongen, a name honoured at sites such as Hakone. The spring itself is known as the "Kobo no reisen", after Kukai, who according to legend struck water here by his powers for farmers suffering from drought.

Kumano Shimizu lies in Sazubo, Chonan, Chiba Prefecture, a short walk from the Ichino bus stop on the line linking Mobara Station (JR Sotobo Line) with Otaki Station (Isumi Railway). By car, the nearest interchange is Mobara-Chonan on the Ken-O Expressway. The water flows at about 48 litres per minute and is used for irrigation; if you drink it, boil it first.

The spring is also called Kōbō no Reisui, after a legend that Kūkai struck water from the ground by his powers when farmers suffered from drought. It is the only site in Chiba Prefecture among the 100 Famous Waters, selected in 1985.