Flat gardens in Japanese are known as

Flat gardens in Japanese are known as Hira-Niwa.
A garden made on a flat lot. The term is used in contrast to hill and pond gardens. Most dry landscape gardens belong to this type. The term hira niwa has been used since the mid-Edo period.
The Flat Garden [hira-niwa] is an example of how gardens in Japan have continued to develop the dry landscape style of the karesansui over time.
In such gardens, the designer works to balance the flat planes of the ground with the volume of stones, clipped shrubbery and trees.