Hanoi's Old Quarter - the 36 streets (Phố Cổ) - occupies approximately one square kilometre north of Hoan Kiem Lake and represents one of the best-preserved medieval merchant districts in Southeast Asia. The district's structure dates to the Lý dynasty in the 13th century, when guilds of craftsmen and traders from surrounding villages established streets organised around specific trades: silver smiths on Hàng Bạc, silk merchants on Hàng Gai, paper sellers on Hàng Giấy.
The street names, most beginning with 'Hàng' (goods/merchandise), preserve this guild geography even as the trades themselves have largely given way to tourism commerce, clothing manufacture, and general retail. The physical fabric - narrow lanes, ancient tube houses extending deep behind thin street frontages, layered Chinese, French colonial, and Vietnamese architectural influences - remains largely intact despite significant pressure from development and tourism.