A ha-ha, also known as a sunk fence, blind fence, ditch and fence, deer wall, or foss, is a recessed landscape design element that creates a vertical barrier while preserving an uninterrupted view of
Comparison of a ha-ha (top) and a regular wall (bottom). Both walls prevent access, but one does not block the view looking outward.
A wall with a ha-ha opening at the Hameau de la Reine, Versailles
Ha-ha protecting the lawn at Hopetoun House, West Lothian, Scotland. Note how the wall disappears from view as it curves away to the left of the photograph.
Ha-ha and south face of Parham Park, West Sussex, England
The Royal Crescent is a row of 30 terraced houses laid out in a sweeping crescent in the city of Bath, England. Designed by the architect John Wood, the Younger, and built between 1767 and 1774, it is
Ha-ha
…is accompanied by Ha-Ha Road that runs alongside its full length. There is a shorter ha-ha in the grounds of the nearby Jacobean Charlton House. The Royal Crescent row of 30 terraced houses in Bath, Somerset, which were built between 1767 and 1774 in the Georgian architecture style, also feature a large ha-ha that…
Royal Crescent from a hot air balloon, contrasting its uniform public front façade against its more architecturally varied private rear.
The Royal Crescent in Bath by Thomas Malton 1780
Ha-ha in front of the Royal Crescent
The completion of the building work in 1769