The Stonehenge Landscape is a property of The National Trust, located on Salisbury Plain in Wiltshire, England. The estate (formerly known as Stonehenge Historic Landscape and before that as Stonehenge Down) covers 2,100 acres (850 ha) surrounding the neolithic monument of Stonehenge which is administered by English Heritage. Much of the land is designated open access by the Trust, including the fields immediately around Stonehenge and other fields that become available as part of the chalk grassland reversion project (see below).