 At the beginning of the 20th century Hanoi consisted of the "36 streets", the citadel, and some of the newer French buildings south of Hoàn Kiếm lake, most of which are now part of Hoàn Kiếm district.Each street had merchants and households specializing in a particular trade, such as silk, jewelry or even bamboo.The street names still reflect these specializations, although few of them remain exclusively in their original commerce.