why London was built on its own site?

Question

answer to be more geographical

Answer 1

The site of London has been inhabited since prehistoric times and developed for many reasons. The River Thames gave easy access to the sea and it provided a navigable way far up stream. It has a number of tributaries which in the past were also navigable. London developed at the first point where the Thames was relatively easy to cross. The river provided a constant water source and also gave a huge supply of fish. The flat marshy land around was full of wildfowl which were also used as food. Within easy distance were large forests which gave building material and fuel also open land which was perfect for grazing sheep. Land on the flood planes of the Thames is very fertile and so crops grow with ease. All in all an ideal place for a city to develop. I think that Winston Churchill summed it very well when he described the Thames as "That silver thread running through the history of England"

Answer 2

Where else would it have been built? If it had been built somewhere else it would have been called something different, like Birmingham, or Leeds. Duh!