Information: - Derby is a city and unitary authority in Derbyshire, England. It lies on the banks of the River Derwent in the south of Derbyshire, of which it was traditionally the county town. At the 2011 census, the population was 248,700. Derby gained city status in 1977. - Sir Richard Arkwright (23 December 1732 in Preston 3 August 1792 in Cromford) was an inventor and a leading entrepreneur during the early Industrial Revolution. Although his patents were eventually overturned, he is credited with inventing the spinning frame, which following the transition to water power was renamed the water frame. He also patented a rotary carding engine that transformed raw cotton into cotton lap. - A World Heritage Site is a landmark which has been officially recognized by the United Nations, specifically by UNESCO. Sites are selected on the basis of having cultural, historical, scientific or some other form of significance, and they are legally protected by international treaties. UNESCO regards these sites as being important to the collective interests of humanity. - Derwent Valley Mills is a World Heritage Site along the River Derwent in Derbyshire, England, designated in December 2001. It is administered by the Derwent Valley Mills Partnership. The modern factory, or 'mill', system was born here in the 18th century to accommodate the new technology for spinning cotton developed by Richard Arkwright. With advancements in technology, it became possible to produce cotton continuously. The system was adopted throughout the valley, and later spread so that by 1788 there were over 200Arkwright-type mills in Britain. Arkwright's inventions and system of organising labour was exported to Europe and the United States. - A County town is usually the location of administrative or judicial functions within the county, or it has been established over time as the "de facto" main town of a county. The concept of a county town eventually became detached from its original meaning of where the county administration or county hall is based. In fact, many county towns are no longer part of the administrative county. For example, Nottingham is administered by a unitary authority entirely separate from the rest of Nottinghamshire. Many county towns are classified as cities, but all are referred to as county towns regardless of whether city status is held or not. - A unitary authority is a type of local authority that has a single tier and is responsible for all local government functions within its area or performs additional functions which elsewhere in the relevant country are usually performed by national government or a higher level of sub-national government. - Derbyshire (or ; abbreviated Derbys. or Derbs.) is a county in the East Midlands of England. A substantial portion of the Peak District National Park lies within Derbyshire, containing the southern extremity of the Pennine range of hills which extend into the north of the county. The county contains part of the National Forest, and borders on Greater Manchester to the northwest, West Yorkshire to the north, South Yorkshire to the northeast, Nottinghamshire to the east, Leicestershire to the southeast, Staffordshire to the west and southwest and Cheshire also to the west. Kinder Scout, at 636 metres (2,087ft), is the highest point in the county, whilst Trent Meadows, where the River Trent leaves Derbyshire, is its lowest point at 27 metres (89ft). The River Derwent is the county's longest river at 66 miles (106km), and runs roughly north to south through the county. In 2003 the Ordnance Survey placed Church Flatts Farm at Coton in the Elms (near Swadlincote) as the furthest point from the sea in Great Britain. - Little Chester, also known as Chester Green after the area of open parkland at its centre, is a suburb of the city of Derby, in Derbyshire, England. It is located approximately north of the city centre, on the east bank of the River Derwent. It forms part of the Darley ward along with Darley Abbey and the West End. Little Chester is the oldest inhabited part of Derby, having been the location of a fortified Roman settlement called Derventio. - Darley Abbey is a historic mill village , now a suburb of the city of Derby , England . It is located approximately 1.4 miles ( 2.3 km ) north of the city centre , on the west bank of the River Derwent , and forms part of the Darley ward along with Little Chester and the West End . The settlement dates back to the medieval era , when it was the site of an Augustinian monastery . In the 18th century , the Evans family developed their planned industrial mill village in the area ; Darley Abbey is now part of the Derwent Valley Mills World Heritage Site . What entity does 'darley abbey' has the relation 'located in the administrative territorial entity' with?
A:
derbyshire