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Back in the 80's the Kowloon Walled City in Hong Kong had a population of 33,000 residents within its 6.4-acre borders.

That gives it a population density of 3.25 million people per square mile! Can you imagine living in a place like that?

Hong Kong is crrazy, huge buildings with hundreds of flats!

Two cities of India only? This is a surprise as Casablanca in this ranking.

It is so crowded over there. I have been there an inside the medina you cannot even walk!