The River Thames in London at sunset, with the Tower Bridge and London skyline in the background. While best known because its lower reaches flow through central London, the river flows across most of southern England. The river gives its name to the Thames Valley, a region of England centred around the river between Oxford and West London, the Thames Gateway, the area centred around the tidal Thames, and the Thames Estuary to the east of London.

http://upload.wikimedia.org/wikipedia/commons/6/6e/London_Thames_Sunset_panorama_-_Feb_2008.jpg