Thames voted 'worst river' in England and Wales
17 November 2010 Last updated at 07:46 GMT
The Thames is the worst river in England and Wales according to a poll, despite major efforts to clean it up in recent years.
The Wye, which starts in mid Wales, winds over England's border and back and runs into the Severn Estuary was voted the public's favourite.
The survey was conducted by the Our Rivers campaign, which aims to celebrate the nations' rivers and highlight threats to wildlife.
BBC Breakfast's Tim Muffet has been finding out more.