The River Tees winds through Teesside and the Tees Valley, all the way from the North Pennines at Cross Fell to the North Sea between Hartlepool and Redcar, passing through picturesque countryside and industrial cities on its way. The route taken by the river formed the boundary between the historic counties of Yorkshire and Durham. Over the course of its history, the River Tees has played a vital role in the economy in different ways. During the Industrial Revolution, the River Tees was key to the transportation of industrial goods, including coal from the Durham Coalfields, while in the twentieth century the river contributed to the development of the chemical industry. As author Tosh Warwick takes us on a trip down the Tees, even those who know the river well might be surprised at what they find along the way.