Kōraku-en is a Japanese garden located in Okayama, Okayama Prefecture. It is one of the Three Great Gardens of Japan, along with Kenroku-en and Kairaku-en. Korakuen was built in 1700 by Ikeda Tsunamasa, lord of Okayama. The garden reached its modern form in 1863. Zhu Zhiyu, one of the greatest scholars of Confucianism in the Ming dynasty and Edo Japan, helped to redesign the garden.