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London on the water
The River Thames flows through southern England, generally through London. At 215 miles, it is the longest river in England and second longest in the UK, to the River Severn. The Thames flows through Oxford, Reading, Henley-on-Thames and Windsor.
The seaward end of the river is called the Tideway, and this name comes from its long tidal reach up to Teddington Lock. The River rises at Thames Head in Gloucestershire and flows all the way to the North Sea via the Thames Estuary.
Most of the Thames London stretch and has a range (rise and fall) of 7 metres (23 ft). Along the course of the river, there are 45 navigation locks with accompanying weirs. The stream contains over 80 islands. With its waters varying from freshwater to almost seawater.