The river Thames

The river Thames is a river of the south of England. It is born in elcondado of Gloucestershire, Kemble's locality, then constant for Oxford, Wallingford, Reading, Henley-on-Thames, Marlow, Maidenhead, Eton, Windsor and London and ends in the sea of the North. It possesses islands along the river they are known like ait, for example.
During the Pleistocene, the primitive river Thames was flowing from Wales up to Clacton-on-Sea, crossing what at present is the North Sea to end up by being a tributary of the Rhine. This course was blocked by a mass of ice during the Age of Ice. The river turned aside up to taking his current course, coming up to the one that is today the city of London.
During the XVIth and XVIIth century, the river was one of the principal means of transport between London and Westminster. From the 19th century the river started contaminating. At the end of this century until middle of the 20th century, a massive cleanliness of the Thames was realized. At present it is one of the cleanest rivers of those who flow across a great city.
His length is 346 km.
This one is a documentary about the river Thames:
http://www.youtube.com/watch?v=5tlKvPCM_FI