Question: Chungking Mansions is a building located at 36–44 Nathan Road in Tsim Sha Tsui, Kowloon, Hong Kong, the unusual atmosphere of the building is sometimes compared to that of the former Kowloon Walled City, Kowloon Walled City was a largely-ungoverned densely-populated settlement in Kowloon City in which region?
Sentence (from "Kowloon Walled City"): From the 1950s to the 1970s, it was controlled by local triads and had high rates of prostitution, gambling and drug abuse.
Relevant evidence: No