What are the 20 largest hotels in the world?

There is no official registry of hotel rooms in London, but the estimated the number of hotel rooms in Greater London in 2000 was put at 101,269. According to figures produced in support of London's 2012 Olympic bid, there were more than 70,000 three to five star hotel rooms within 10 kilometres of Central London in 2003. Interestingly the main growth was a huge rise in the number of rooms within the City of London, while Kensington and Chelsea actually had a small fall. This is comparing figures since 1981. The main concentration of luxury hotels is in the West End, especially in Mayfair. London's five star hotels are quite small on average by international standards. The largest has only 459 rooms and nine of them have fifty or less. The range is very wide, including: