Information:  - Wrexham (; ) is a large town in north Wales, between the Welsh mountains and the lower Dee Valley alongside the border with England. In Wrexham County Borough, it is the largest town in north Wales and an administrative, commercial, retail and educational centre.  - Llangollen is a small town and community in Denbighshire, north-east Wales, situated on the River Dee and on the edge of the Berwyn mountains. It had a population of 3,658 at the 2011 census.  - Constrained Energy Lapped Transform (CELT) is an open, royalty-free lossy audio compression format and a free software codec with especially low algorithmic delay for use in low-latency audio communication. The algorithms are openly documented and may be used free of software patent restrictions. Development of the format was maintained by the Xiph.Org Foundation (as part of the Ogg codec family) and later coordinated by the Opus working group of the Internet Engineering Task Force (IETF).  - Cefn Mawr is a large village in the community of Cefn within the County Borough of Wrexham, Wales. Its name translates as "big ridge".  - Denbighshire is a county in north-east Wales. It is named after the historic county of Denbighshire, but has substantially different borders. Denbighshire has the distinction of being the longest known inhabited part of Wales. Pontnewydd (Bontnewydd-Llanelwy) Palaeolithic site has Neanderthal remains from 225,000 years ago. There are several castles in the region: Denbigh Castle, Rhuddlan Castle, Ruthin Castle, Castell Dinas Bran and Bodelwyddan Castle. One of Britain's smallest cathedrals is at St Asaph, itself one of the smallest cities.  - England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west. The Irish Sea lies northwest of England and the Celtic Sea lies to the southwest. England is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain (which lies in the North Atlantic) in its centre and south; and includes over 100 smaller islands such as the Isles of Scilly, and the Isle of Wight.  - Ruabon is a village and community in the county borough of Wrexham in Wales. The name "Rhiwabon" comes from "Rhiw Fabon", "Rhiw" being the Welsh word for "hill" and "Fabon" being a mutation from St Mabon, the original church name, of earlier, Celtic origin (see Mabon)." An older English spelling, Rhuabon, can sometimes be seen.  - Wales is a country that is part of the United Kingdom and the island of Great Britain. It is bordered by England to the east, the Irish Sea to the north and west, and the Bristol Channel to the south. It had a population in 2011 of 3,063,456 and has a total area of . Wales has over of coastline and is largely mountainous, with its higher peaks in the north and central areas, including Snowdon, its highest summit. The country lies within the north temperate zone and has a changeable, maritime climate.  - Acrefair ( Welsh pronunciation : ( akrvr ) ) is a village in the county borough of Wrexham , Wales . It was formerly part of the ancient parish of Ruabon , and is located between the towns of Wrexham and Llangollen . It is close to the villages of Trefor , Cefn Mawr , Ruabon and Plas Madoc . The name Acrefair originates from the Welsh word for acres - acrau , or acre in the local Welsh dialect - and Mair , the Welsh name for Mary . We therefore have Acre - Mair , which leads to Acre - fair , as there is a soft mutation on the second element of a composite word . The English meaning of Acrefair is Mary 's Acres . Parts of Acrefair have beautiful views across the River Dee and the Dee Valley . Acrefair has a newsagents , a petrol station , a post office , a chemist and two Chinese take - aways . It boasts many buildings built from `` Ruabon Red brick '' , including several chapels which are now closed and converted . ( citation ) Edward Lloyd Rowland established an ironworks here in c.1817 . Following his bankruptcy in 1825 the works were bought by the British Iron Company . The company was re-formed in 1843 as the New British Iron Company and they continued to operate the works until its closure in 1887 . The site was subsequently occupied by a succession of businesses , latterly Air Products , which produced air separation equipment for industry . The site ceased to be a commercial venture in late 2009 . Acrefair and Cefn Mawr were also home to the Monsanto Company chemical works , which had produced chemicals since before World War II. The site was the American company 's first venture in Europe . Monsanto later operated the site as FlexSys , one of their subsidiaries , but production on this site ceased in 2010 . Coal , clay and iron were also worked in the area during its industrial period . Acrefair railway station was formerly a station on the Ruabon to Barmouth line , it closed to passengers on Monday 18 January 1965 as part of the Beeching Axe . The Ruabon Brook Tramway passed through the village at...  - County borough is a term introduced in 1889 in the United Kingdom of Great Britain and Ireland (excluding Scotland), to refer to a borough or a city independent of county council control. They were abolished by the Local Government Act 1972 in England and Wales, but continue in use for lieutenancy and shrievalty in Northern Ireland. In the Republic of Ireland they remain in existence but have been renamed "cities" under the provisions of the Local Government Act 2001. The Local Government (Wales) Act 1994 re-introduced the term for certain "principal areas" in Wales. Scotland did not have county boroughs but instead counties of cities. These were abolished on 16 May 1975. All four Scottish cities of the time  Aberdeen, Dundee, Edinburgh, and Glasgow  were included in this category. There was an additional category of large burgh in the Scottish system, which were responsible for all services apart from police, education and fire.  - Wrexham County Borough is a local government principal area centred on the town of Wrexham in north-east Wales. The county borough has a population of nearly 135,000 inhabitants. Just under half of the population live either within the town of Wrexham or its surrounding conurbation of urban villages which has a population of around 63,000 people. The remainder live to the south and east of the town in more rural areas. The area has strong links with coal-mining.    What is the relationship between 'acrefair' and 'wrexham county borough'?
The answer to this question is:
located in the administrative territorial entity