和平省
On 29 May 2008, it was decided that Hà Tây Province, Vĩnh Phúc Province's Mê Linh District and 4 communes of Lương Sơn District, Hòa Bình Province be merged into the metropolitan area of Hanoi from 1 August 2008. Hanoi's total area then increased to 334,470 hectares in 29 subdivisions with the new population being 6,232,940., effectively tripling its size. The Hanoi Capital Region (), a metropolitan area covering Hanoi and 6 surrounding provinces under its administration, will have an area of with 15 million people by 2020.