Is the Thames a sea or a river?

Starting as a small trickle in the Cotswolds the River Thames travels over 210 miles through the heart of some of England's most picturesque towns, right into the centre of London and eventually, out into the North Sea.



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The Thames is one of the World's most fascinating and beautiful rivers. From source to sea, its 215 miles flow from springs in Gloucestershire through rural and developed areas to London and on to the imposing tidal estuary into the North Sea.

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The Thames is some 205 miles (330 km) long, running 140 miles (226 km) from the source to the tidal waters limit—i.e., from Thames Head to Teddington Lock—and, as an estuary, a further 65 miles (104 km) from there to The Nore sandbank, which marks the transition from estuary to open sea.

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Between Teddington and Chelsea the tidal Thames is freshwater, from Chelsea downstream it becomes more mixed (brackish) until it becomes a marine environment below Greenwich. This change in salt levels impacts the types of fish and wildlife you find in different stretches of the river.

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In British English, “river” almost always precedes the proper name: the River Thames and the River Severn. In North American English, “river” usually comes last: the Mississippi River, the Saint Lawrence River.

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Where Can You Swim? The PLA allows swimming to take place upriver of Putney Bridge through to Teddington. It is permitted in this area only but be reminded that it is still a busy section of the tidal Thames for leisure and recreational activities.

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The Thames is considered to be the cleanest river in the world that flows through a major city. The Thames is home to 125 species of fish and more than 400 invertebrates. This is in spite of the fact that raw sewage is routinely pumped into the river during heavy rains.

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A navigational error: according to the scientists who conducted the post-mortem, the most likely explanation for the incident was simply that the whale was seeking to return to its normal feeding grounds in the North Atlantic and took a wrong turn, mistakenly swimming west up the Thames rather than taking the longer ...

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Interesting facts about the Thames
  • 1 …is one of the cleanest rivers in the world that flows through a major city? ...
  • 3 …used to host Frost Fairs on its surface? ...
  • 4 …is the longest river in England? ...
  • 5 …provides 2/3 of London's drinking water? ...
  • 6 … ...
  • 7 …is crossed by over 200 bridges? ...
  • 8 …was the pool of a polar bear?


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The River Thames, known alternatively in parts as the River Isis, is a river that flows through southern England including London. At 215 miles, it is the longest river entirely in England and the second-longest in the United Kingdom, after the River Severn.



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More than 50 million years of erosion and climate change have shaped the Thames to create the river we know today, flowing from Gloucestershire into the English Channel.

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The overall bill increase is mainly due to inflation, including rising energy prices. Part of the bill increase also depends on our company performance. In 2021/22 we achieved most of our water supply targets, such as those relating to leaks and supply interruptions.

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The Greenwich Foot Tunnel is an underground walkway that allows you to walk from Greenwich to the Isle of Dogs in London. The reason why this tunnel is so special is that it allows you to walk under the River Thames which is the main river that snakes through the city.

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