Yên Bái is a province located in Tây Bắc, the northern part of northern-central Vietnam. It shares borders with six provinces which are Hà Giang province, Lào Cai province, Lai Châu province, Sơn La province, Phú Thọ province, and Tuyên Quang province. The province covers an area of about 6,893 km2 (2,661 sq mi) and as of 2022 it had a population of 847,250 people.

Đông Bắc 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 or "Northwest", but it is actually in the north and northeast of Hanoi, wider than Việt Bắc or "Northern Vietnam". The Northeast is one of three sub-regions of Northern Vietnam. Sometimes the Northeast includes the Red River Delta.