The River Thames in London is approximately 84 miles (135 kilometres) long. It flows through the city from its source in the Cotswold Hills in Gloucestershire, England, to its mouth at the North Sea.
Width:
The width of the River Thames varies along its course, but it is generally quite wide in London. In the central part of the city, it is around 200-300 metres (650-1000 feet) across. However, the river becomes much wider as it approaches its mouth, reaching a maximum width of about 1,800 metres (6,000 feet) near Southend-on-Sea.
Depth:
The depth of the River Thames also varies, but it is generally between 10-15 metres (33-49 feet) deep in London. The deepest point is about 27 metres (88 feet) near the Tower Bridge.
Tidal Influence:
The River Thames is a tidal river, meaning that its level rises and falls with the tide. The tidal influence can be felt up to Teddington Lock, about 12 miles (19 kilometres) upstream from the city centre. The average tidal range in London is about 7 metres (23 feet).
