In front of the Royal Crescent is a ha-ha, a ditch on which the inner side is vertical and faced with stone, with the outer face sloped and turfed, making an effective but invisible partition between the lower and upper lawns. The ha-ha is designed so as not to interrupt the view from Royal Victoria Park, and to be invisible until seen from close by. It is not known whether it was contemporary with the building of the Royal Crescent, however it is known that when it was first created it was deeper than it is at present. The railings between the crescent and the lawn were included in the Heritage at Risk Register produced by English Heritage but have been restored and removed from the register.