Three Great Gardens of Japan

The Three Great Gardens of Japan (日本三名園, Nihon Sanmeien^?), also known as "the three most famous gardens in Japan" are considered to include Kenroku-en in Kanazawa, Koraku-en in Okayama and Kairaku-en in Mito.

The conception of gardens in a group of three is found elsewhere; for example, in the three gardens of Emperor Go-Mizunoo who abdicated in 1629. At Shūgakui rykū, Go-Mizunoo maintained landscaped areas at separate elevations on the northeastern outskirts of Kyoto.

...
Wikipedia