Omizuen was the garden of the Kinoshita clan and the Ashimori domain head. It is located at the foot of Mt Miyaji, and is constructed around a pond at its center. It is unclear when the garden was built, but the 6th head, Kinoshita Kinsada is reckoned to have built it in the early 18th century. It is a Zen garden designed by Enshu.

Omizuen is one of the biggest gardens in Okayama prefecture, like Korakuen in Okayama City and Shurakuen in Tsuyama City.

There is a teahouse called Ginpukaku just near the pond. The view from the house is especially beautiful because the garden harmonizes with the backdrop of Mt. Uno behind it. Ginpukaku is made from wood that was left over from the construction of Kyoto Imperial Palace. The roof used to be thatched but is now covered with copper sheeting.

Within the garden you can see a monument inscribed with a poem by Kinoshita Rigen, a local poet of the Shirakaba School, and there are also Maria Lanterns for clandestine Christians.