Tributaries bring water to the river from a wide area of land. The area of land which supplies a river with water is called its drainage basin or catchment area.
The Thames basin is the name of the area surrounding the River Thames. Any rain falling on it ends up in the Thames, which takes it to the sea.
The Thames basin covers an area of approximately 12,935 square kilometres (4,994 square miles). 13 million people live in the basin, 7 million of which live in London.
The Thames basin receives an average of 690 mm rainfall per year, making it one of the driest parts of the UK.
The yellow area below shows the Thames's drainage basin - the area drained by the Thames and its tributaries.
Did you know? The Amazon basin is seven hundred times bigger than the Thames basin.
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