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Lower river

As the river nears the sea, it flows in a wide floodplain and the valley sides are very gentle. You often don't know you are in a valley. The river may also be tidal.

Lower valleys are used by big cities and the river sides are often built over. For example, when the Romans saw London, 2,000 years ago, it was three times wider than it is today!

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Q1: The banks of the River Thames at London are topped with a wall called the embankment. Why is a wall needed?

[Answer]