Which river runs through London?

The Thames is the longest river in England, spanning 215 miles from Gloucestershire through London and into the Thames Estuary, from where it flows into the North Sea. As the drainage basin for the whole of London, the river has a rise and fall of as much as 23 feet. The river is also the source of around 50 tributaries and contains more than 80 islands within its flow.

Source: Park Grand