Roman Polanski, 1974. Jake Gittes, LA water, and 'forget it, Jake, it's Chinatown.' Noir's modern peak.
From Wikipedia
Chinatown is a common term used to describe an ethnic enclave of Chinese people located outside of Mainland China, Hong Kong, Macau, and Taiwan, typically situated in an urban area. Chinatowns can be found around the world, including in Europe, Asia, Africa, Oceania, and the Americas. The history of Chinatowns date back to the Tang dynasty in the 10th century, arising from the nation's important role in global trade.