Over the next 300 years, between 900 and 1200, the Khmer Empire produced some of the world's most magnificent architectural masterpieces in the area known as Angkor. Most are concentrated in an area approximately east to west and north to south, although the Angkor Archaeological Park, which administers the area, includes sites as far away as Kbal Spean, about to the north. Some 72 major temples or other buildings are found within this area, and the remains of several hundred additional minor temple sites are scattered throughout the landscape beyond. Because of the low-density and dispersed nature of the medieval Khmer settlement pattern, Angkor lacks a formal boundary, and its extent is therefore difficult to determine. However, a specific area of at least beyond the major temples is defined by a complex system of infrastructure, including roads and canals that indicate a high degree of connectivity and functional integration with the urban core. In terms of spatial extent (although not in terms of population), this makes it the largest urban agglomeration in recorded history prior to the Industrial Revolution, easily surpassing the nearest claim by the Mayan city of Tikal. At its peak, the city occupied an area greater than modern Paris, and its buildings use far more stone than all of the Egyptian structures combined.