It was there already. London was built around the river.
The river Thames is England, and is the river that London is built on.
They were built at the south of the River Thames.
London
it was built in London, England over the Thames river
The Thames is a river flowing across London, Great Britain.
because roman wanted a river to drink from.
The only railway under the river Thames is parts of the London Underground (tube).
The River Thames is the major river through London, cutting right through the middle of the city. There are many other rivers in London, such as the River Lee (or Lea) and the River Brent.
Because London is built on the ancient flood plane of the river Thames.
That would be the River Thames.
London is situated on the River Thames (pronounced 'temz'.
London is on the River Thames but not quite at its estuary.