Stonehenge, Avebury and Associated Sites is a UNESCO World Heritage Site located in Wiltshire, England. The WHS covers two large areas of land separated by nearly 30 miles (48 km), rather than a specific monument or building. The sites were inscribed as co-listings in 1986. Some of the large and well known monuments within the WHS are listed below, but the area also has an exceptionally high density of small-scale archaeological sites, particularly from the prehistoric period. More than 700 individual archaeological features have been identified. There are 160 separate Scheduled Monuments, covering 415 items or features.