The Ninomaru Garden uses the "Chisen-Kaiyushiki-Teien" (garden built around the pond) style, popular Japanese garden style in Edo Period. The style represents a cosmic Buddhist world with the pond at the center surrounded by stones in various sizes as well as trees. Viewers of the garden can stroll around the pond to enjoy natural beauty of the season.
In the center of the pond are three islands; Horai-jima (Island of Eternal Happiness), Tsuru-jima (Crane Island), and Kame-jima (Turtle Island).
The design of the garden is attributed to a renown tea master and garden architect named Kobori Enshu.