Kowloon Walled City, Hong Kong

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Kowloon Walled City was a densely populated, largely ungoverned settlement in Kowloon, Hong Kong. Its population increased dramatically following the Japanese occupation of Hong Kong during World War II. In 1987, the Walled City contained 33,000 residents within its 6.5-acre (0.026 km2; 0.0102 sq mi) borders. Originally a Chinese military fort, the Walled City became an enclave after the New Territories were leased to Britain in 1898. [Wiki]