Tây Bắc (literally "Northwest") is one of the regions of Vietnam, located in the mountainous northwestern part of the country. It consists of four provinces: Điện Biên, Lai Châu, Sơn La and Lào Cai. It has a population of 4.9 million (2022) and it is fully landlocked.
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Tây Bắc in the context of Northeast (Vietnam)
Đông Bắc (literally "Northeast" from Chinese: 東北; pinyin: Dōngběi) is the region to the north of the Red River Delta in Vietnam, bordering China. It is called Northeast to distinguish it from the Tây Bắc (Chinese: 西北; pinyin: Xīběi) or "Northwest", but it is actually in the north and northeast of Hanoi, wider than Việt Bắc (Chinese: 越北联区; pinyin: Yuè Běi Lián Qū) or "Northern Vietnam". The Northeast is one of three sub-regions of Northern Vietnam (the other two sub-regions are the Northwest and the Red River Delta). Sometimes the Northeast includes the Red River Delta.
View the full Wikipedia page for Northeast (Vietnam)