Downstream of Barnard Castle and Teesdale the River Tees flows in to the much broader Tees Valley, passing through the industrial towns of Darlington and Middlesbrough in Teeside before reaching the sea at the northern end of the Yorkshire Coast.
The following (externally maintained) websites and web pages include further information about Teesdale, Teeside and the Tees Valley:
The North York Moors
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