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The park was originally used as the shiro (下屋敷) of the Morioka Nanbu Domain during the Edo period. In Meiji 29 (1896), it became the property of the Ariake-kō family, and later in Shōwa 9 (1934), it was granted to Tokyo City and opened to the public as a memorial park.
The park preserves ruins of a daimyo (大名) garden from the Edo period, utilizing the varied terrain of the Azumabune plateau to create hills, valleys, and ponds, making it a Japanese garden rich in natural beauty. In spring, visitors can enjoy plum blossoms, cherry blossoms, and dogwoods; in summer, hydrangeas and irises; and in autumn, ginkgo and maple trees, decorating the park with a picturesque array of seasonal flowers and foliage. Notably, the cherry blossoms include up to 11 varieties, such as Somei Yoshino (染井吉野) and Yamazakura (山桜), captivating all those who come to admire them.
With a spacious area of approximately 67,000 square meters, the park features a significant slope from high ground to low. The walking paths are moderately modified for ease of access, with varying heights suitable for exercise.
In addition, the park houses the Tokyo Metropolitan Central Library, which boasts the largest collection of books in all of Japan, allowing visitors to enjoy reading in a tranquil space filled with greenery.