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| | Reference.com/Encyclopedia/River Thames |
 | | The whole of the River Thames drains a catchment area of some 12,935 square km (4994 square miles) (or 15,343 square km (5924 square miles) if the River Medway is included as a tributary). |
 | | It is now the cleanest river in the world that flows through a city.In the early 1980s, a massive flood-control device, the Thames Barrier, was opened. |
 | | If the Thames were not a tidal river, its average discharge in the centre of London would be somewhere between 80 and 100 m³/s, and the Thames would look like a small river, not the large river we can see today by Westminster, the Houses of Parliament or the City. |
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