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The '''River Tees''' is a major river in northern [[England]]. It rises on Cross Fell in [[Cumbria]] and flows through [[County Durham]], north [[Yorkshire]] and [[Cleveland]] before entering the [[North Sea]] at [[Redcar]]. In its upper reaches it flows through the upland country of the North [[Pennines]]. Its middle reaches flow through agricultural countryside. The lower reaches of the Tees - from [[Stockton on Tees]] to the sea pass through a heavily industrialised landscape. [[Teesside]] (Stockton, Thornaby, [[Middlesbrough]] and neighbouring settlements) was the site of coal export facilities, shipbuilding, chemicals manufacture and iron and steel making; and chemicals and steel are still the industrial mainstay of the area.