River Leven, North Yorkshire River Leven, North Yorkshire The River Leven is a river in North Yorkshire, England, a tributary to the River Tees. It rises on Warren Moor, part of Kildale Moor, in the North York Moors and flows to the north of the moors to join the River Tees at Yarm. The source of the river is on Warren Moor, part of Kildale Moor, just south of the village of Kildale. It flows east until it reaches the Whitby to Middlesbrough rail line where it does a complete turnaround to flow west to Kildale. It then flows south-south-west through woodland to the
Middlesbrough 16% of Middlesbrough's population in 1871. Business in Middlesbrough is still dominated by the nearby chemical industry which until 1995 in this locality was largely owned by Imperial Chemical Industries (ICI). The fragmentation of that company led to many smaller manufacturing units being owned and operated by a number of multinational organisations. The last part of ICI itself completely left the area in 2006 and the remaining companies are now members of the Northeast of England Process Industry Cluster (NEPIC). The port of Teesport, owned by PD Ports, is also vital to the economy of Middlesbrough and the port owners