Teesside in the context of Ingleby Barwick

North Yorkshire is a ceremonial county in Northern England. It is bordered by County Durham to the north, the North Sea to the east, the East Riding of Yorkshire to the south-east, South Yorkshire to the south, West Yorkshire to the south-west, and Cumbria and Lancashire to the west.

The county is the largest in England by land area, at 8,654 km (3,341 sq mi), and had a population of 1,201,415 in 2024. Middlesbrough and Redcar are located in the north-east of the county and form part of the Teesside conurbation, which extends into County Durham. The city of York is located in the south. The remainder of the county is rural, and its settlements include Harrogate in the south-west, the city of Ripon near the centre, and Scarborough on the coast in the east. For local government purposes the county comprises the unitary authority areas of North Yorkshire, Middlesbrough, Redcar and Cleveland, York, and part of Stockton-on-Tees. The local authorities of York and North Yorkshire form a combined authority of the same name, and the local authorities of the other three areas are part of the Tees Valley Combined Authority. The county was historically part of Yorkshire.

Yorkshire (/ˈjɔːrkʃər, -ʃɪər/ YORK-shər, -⁠sheer) is an area of Northern England which was historically a county. Despite no longer being used for administration, Yorkshire retains a strong regional identity. The county was named after the city of York.

The south-west of Yorkshire includes the cities of Leeds, Sheffield, Bradford, Doncaster and Wakefield. The north and east of the county includes the southern part of the Teesside conurbation; the port city of Hull is located in the south-east. York is positioned near the centre of the county. Yorkshire has a coastline on the North Sea. The North York Moors occupy the north-east of the county, and the centre contains the Vale of Mowbray and the Vale of York. The west contains part of the Pennines, which includes the Yorkshire Dales.

County Durham, officially simply Durham, is a ceremonial county in North East England. The county borders Northumberland and Tyne and Wear to the north, the North Sea to the east, North Yorkshire to the south, and Cumbria to the west. The largest settlement is Darlington.

The county has an area of 2,676 square kilometres (1,033 sq mi) and had a population of 894,025 in 2024. The centre and east of the county are more densely populated than the west, and the major settlements include Hartlepool on the south-east coast, Stockton-on-Tees in the south-east, Darlington in the south, and the city of Durham in the north-centre. Stockton-on-Tees is part of the Teesside conurbation, which extends into North Yorkshire. Barnard Castle is the largest town in the west of the county. For local government purposes the county comprises the unitary authority areas of County Durham, Darlington, Hartlepool, and part of Stockton-on-Tees. Durham County Council is part of the North East Combined Authority, and the councils of the other three areas are part of the Tees Valley Combined Authority. The part of Tyne and Wear south of the River Tyne was historically part of County Durham, and the part of Durham south of the River Tees was historically part of the North Riding of Yorkshire.

The River Tees (/tiːz/), in England, rises on the eastern slope of Cross Fell in the North Pennines and flows eastwards for 85 miles (137 km) to reach the North Sea in the North East of England. The modern-day history of the river has been tied with the industries on Teesside in its lower reaches, where it has provided the means of import and export of goods to and from the North East England. The need for water further downstream also meant that reservoirs were built in the extreme upper reaches, such as Cow Green.

Middlesbrough (/ˈmɪdəlzbrə/ MID-əlz-brə), colloquially known as Boro, is a port town in the Borough of Middlesbrough, North Yorkshire, England. Lying to the south of the River Tees, Middlesbrough forms part of the Teesside built-up area and the Tees Valley. In 2021 it had a population of 148,215.

Redcar /ˈrɛdkər/ /rɛdkɑːr/ is a seaside town on the Yorkshire Coast in the Redcar and Cleveland district. It is in the ceremonial county of North Yorkshire, England, and is located 7 miles (11 km) east of Middlesbrough.

The Teesside built-up area's Redcar subdivision had a population of 37,073 at the 2011 census. The town is made up of Coatham, Dormanstown, Kirkleatham, Newcomen, West Dyke, Wheatlands and Zetland.

Stockton-on-Tees is a market town in County Durham, England, with a population of 84,815 at the 2021 UK census. It gives its name to and is the largest settlement in the wider Borough of Stockton-on-Tees. It is part of Teesside and the Tees Valley, on the northern bank of the River Tees.

The River Tees was straightened in the early 19th century, so that larger ships could access the town. The ports have since relocated closer to the North Sea, and ships are no longer able to sail from the sea to the town. This is due to the building of the Tees Barrage, which was installed to manage tidal flooding. The Stockton and Darlington Railway served the port during the early part of the Industrial Revolution. The railway was also the world's first permanent steam-powered passenger railway.

Cow Green Reservoir is a 2-mile (3 km) long water reservoir forming part of the border between the historic counties of Westmorland and County Durham in northern England, built by Mitchell Construction between 1967 and 1971 to supply the industries of Teesside.

The reservoir acts as a river regulation reservoir releasing water into the River Tees during dry conditions so that it can be abstracted further downstream. These regulated flows allow six further reservoir levels to be maintained and these in turn provide water for industry and domestic use.