River Tees
Overview
 
The River Tees is in Northern England
Northern England
Northern England, also known as the North of England, the North or the North Country, is a cultural region of England. It is not an official government region, but rather an informal amalgamation of counties. The southern extent of the region is roughly the River Trent, while the North is bordered...

. It rises on the eastern slope of Cross Fell
Cross Fell
Cross Fell is the highest point in the Pennine Hills of northern England and the highest point in England outside of the Lake District.The summit, at , is a stony plateau, part of a long ridge running North West to South East, which also incorporates Little Dun Fell at and Great Dun Fell at...

 in the North Pennines
North Pennines
The North Pennines is the northernmost section of the Pennine range of hills which runs north-south through northern England. It lies between Carlisle to the west and Darlington to the east...

, and flows eastwards for 85 miles (137 km) to reach the North Sea
North Sea
In the southwest, beyond the Straits of Dover, the North Sea becomes the English Channel connecting to the Atlantic Ocean. In the east, it connects to the Baltic Sea via the Skagerrak and Kattegat, narrow straits that separate Denmark from Norway and Sweden respectively...

 between Hartlepool
Hartlepool
Hartlepool is a town and port in North East England.It was founded in the 7th century AD, around the Northumbrian monastery of Hartlepool Abbey. The village grew during the Middle Ages and developed a harbour which served as the official port of the County Palatine of Durham. A railway link from...

 and Redcar
Redcar
Redcar is a seaside resort in the north east of England, and a major town in the unitary authority of Redcar and Cleveland in the ceremonial county of North Yorkshire. It lies east-northeast of Middlesbrough by the North Sea coast...

.
It drains an area of 708 square miles (1834 square km) and subsumes no important tributaries. Before the reorganization of the historic English counties
Historic counties of England
The historic counties of England are subdivisions of England established for administration by the Normans and in most cases based on earlier Anglo-Saxon kingdoms and shires...

, the river formed the boundary between County Durham
County Durham
County Durham is a ceremonial county and unitary district in north east England. The county town is Durham. The largest settlement in the ceremonial county is the town of Darlington...

 and Yorkshire
Yorkshire
Yorkshire is a historic county of northern England and the largest in the United Kingdom. Because of its great size in comparison to other English counties, functions have been increasingly undertaken over time by its subdivisions, which have also been subject to periodic reform...

. In its lower reaches it now forms the boundary between the ceremonial counties
Ceremonial counties of England
The ceremonial counties are areas of England to which are appointed a Lord Lieutenant, and are defined by the government as counties and areas for the purposes of the Lieutenancies Act 1997 with reference to the metropolitan and non-metropolitan counties of England and Lieutenancies Act 1997...

 of County Durham and North Yorkshire
North Yorkshire
North Yorkshire is a non-metropolitan or shire county located in the Yorkshire and the Humber region of England, and a ceremonial county primarily in that region but partly in North East England. Created in 1974 by the Local Government Act 1972 it covers an area of , making it the largest...

, while in the highest part of its course it forms the boundary between the historic counties of Westmorland
Westmorland
Westmorland is an area of North West England and one of the 39 historic counties of England. It formed an administrative county from 1889 to 1974, after which the entirety of the county was absorbed into the new county of Cumbria.-Early history:...

 and Durham
County Durham
County Durham is a ceremonial county and unitary district in north east England. The county town is Durham. The largest settlement in the ceremonial county is the town of Darlington...

.
 
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