Sơn Tây is a district-level town in Hanoi, the capital of Vietnam. It was the capital of Sơn Tây province before merging with Hà Đông province to form Hà Tây province in 1965. Sơn Tây lies 35 kilometres (22 mi) west of the capital Hanoi. It had a city status in Hà Tây province. However, when Hà Tây was absorbed into Hanoi, Sơn Tây was demoted from a city to a town.