The Thames is actually one of the cleanest rivers in the world with sharks living in it - here's why it looks so brown and dirty.
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In a people-powered study of pollutant levels in UK freshwater sites, the River Dart was the only one, out of 48, to pass all five parameters. The river runs 75km from Dartmoor and into the sea at Dartmouth.
And the latest figures are alarming: only 14% of England's rivers are classified as being of 'good' ecological status, according to a government report published in January 2022.
As the Thames is tidal, its waters are 'brackish' – a mixture of fresh and saltwater. Drinking untreated Thames river water is unsafe, although historically it has been used for many domestic and industrial purposes including cooking, brewing and generating power.
Tara River, EuropeAlso known as the Jewel of Europe, Tara flows through the Balkan nations of Montenegro and Bosnia-Herzegovina. One of the cleanest rivers in the world, it is a UNESCO protected river under the World's Natural Heritage and the World's Biosphere Reserve.
The Congo is the deepest river in the world. Its headwaters are in the north-east of Zambia, between Lake Tanganyika and Lake Nyasa (Malawi), 1760 metres above sea level; it flows into the Atlantic Ocean.
Fish in the ThamesThere is an incredible 125 species of fish that have been found living amongst the animals in the Thames, and this includes species of conservation and commercial importance.