Hem (Vietnamese: Hẻm) or Ngo (Vietnamese: Ngõ) are the terms used to describe narrow streets branching off of main roads.[1][2][3][4][5] Hem are characterized by their narrow width and are lined with narrow, multistory buildings known as tube houses, creating a dense and vertical urban form.[6][7][8][9]
In 2016, 85% of residents in Ho Chi Minh City and 88% in Hanoi lived in hem alleyways.[5][10] Hem are numbered and referred to by the name of the major street it branches off of, similarly to Sois in Thailand.[11][12] Slashes are used to indicated an address in a hem, so the address "36/23 Hẻm Lê Thị Riêng" indicates the house is number 36 in the 23rd Hem off Lê Thị Riêng street.[5][13]
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