Worlds Largest City by land mass

The City of London is in fact quite small.....It covers an area of one (ONE)square mile

Indeed.Davao City is the worlds largest city by land area calculations

no guys. the 3 south african regions of
Johannesburg (Vaal triangle)
Durban (eThekwini metro) and
Cape Town (cape peninsula)
all with areas greater that 3000km.squared should be at least in the top 10 with the Johannesburg region being the biggest in the world. people often overlook Africa which is a big mistake.

the same goes for a city with a population of 20million living in an area of 23 square km

gauteng south africa is more than twice that

Durban, South Africa - is 2292 km2 and its not even the largest city in the country

For me the best answer for truly largest city is no other than
Davao City, Philippines.........

One problem is how you define the boundaries of a city. Personally I prefer the proper city, which is the political boundary of the city not including any suburbs or incorporated areas within the city boundaries (for example, Beech Grove, Indiana or a few small cities inside the limits of San Antonio, TX). But some go by metro area, consolidated statistical area, or city-county combinations like Nashville-Davidson, TN or several (including Sitka) in Alaska, which has the effect of including rural areas. This problem gets even worse if you try to rate land areas of world cities.

You are almost correct. Mt Isa WAS the second largest city in the world, after Auckland, New Zealand (twice the land area of London). Since Auckland was split into 4 cities and a district (North Shore City, Waitakere City, Auckland City, Manukau City and the Rodney District), it no longer holds top spot. A title now claimed by Mt Isa.

World's Largest City
The residents of Davao City claim they live in the world's largest city. They are talking about the land size of the city that covers 2,212 square kilometers. Most of these areas, however, are distributed as forests, coconut groves and rice fields. In comparison, New York, the largest city in the United States, has an area of only 787 square kilometers while the whole of Metro Manila covers only 636 square kilometers.
Davao City lies at the mouth of the Davao River near the head of Davao Gulf. It encompasses about 50 small ports in its commercial sphere. Davao has large banana plantations, whose produce are exported to Japan and other countries. The city also boasts of a modern international airport. Puerto Princesa City, a chartered city of Palawan province, is disputing Davao City's title. It claims to have a total land area of 2,539 square kilometers encompassing 66 barangays.
In terms of population and land area, the world's truly largest cities are Tokyo, Mexico City, Sao Paolo, New York City, Bombay, Shanghai and Los Angeles.

Metropolitan Davao is indeed the largest city in the world land area wise... a banging 2,444 square kilometer!

Haha 34,000 sq. miles? Hahaha that's the most ridiculous thing I've heard. So what you're saying is that the city of Los Angeles is bigger than South Carolina? I've got news for you partner... LA is 502 sq. miles.