*What is a ha‑ha in garden design?* A ha‑ha is a hidden boundary used in landscape gardens. It’s a sunken ditch with a vertical wall that stops animals like cattle or deer from crossing, while keeping the view open. In France, this feature is often called a saut‑de‑loup, which literally means “wolf jump.” The design feature appears early in French gardens, but the name ha‑ha became popular in 18th‑century English landscape gardens. A good example of a ha‑ha can still be seen at the Jardin des Tu