The River Thames: Geography, Characteristics, and Significance

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Key takeaways

The River Thames spans approximately 330 km and drains a basin of 5,500 square miles (14,250 sq km).
It is the longest river located entirely inside England and supplies two-thirds of Greater London's drinking water.
The Thames Barrier has been operational since 1982 to protect London from severe tidal flooding.
A six-hour multi-agency operation recently rescued 25 pilot whales in the Thames near Gravesend, Kent.

Rescue teams guided a group of 25 pilot whales back to open sea near Gravesend, Kent.
The six-hour multi-agency operation succeeded after the whales drifted into shallow tidal waters of the River Thames.

The River Thames is the principal river of southern England and the longest river located entirely within England.
It is the second-longest river in the United Kingdom after the River Severn.
The river drains a catchment basin covering roughly 5,500 square miles or 14,250 sq km.

The river traditionally originates at Thames Head in the Cotswold Hills.
Another claimed source is the River Churn at Seven Springs.
It flows eastward through major towns like Oxford, Reading, Windsor, and London.
It finally empties into the North Sea through the Thames Estuary.

The river extends for about 330 km, with locks regulating its upper freshwater section while its lower section past Teddington is tidal.
It flows across flat plains with a gentle slope, forming broad loops and meanders along its upper course.
The estuary experiences strong tidal changes, with spring tides rising nearly 7 metres at London Bridge.
Operational since 1982, the Thames Barrier uses ten movable steel gates to protect London from storm surges and flood tides.
Major tributaries include the Windrush, Cherwell, Kennet, Colne, Wey, and Lea, while the River Medway enters the outer estuary.

The Thames supplies about two-thirds of Greater London's drinking water for homes, businesses, and factories.
It serves as a key historical trade route linking London to the North Sea, flowing past landmarks such as Windsor Castle, Westminster, the Tower of London, and Greenwich.