Choa Chu Kang, alternatively spelled Chua Chu Kang and often abbreviated as CCK, is a planning area and residential town located at the northwestern point of the West Region of Singapore. The town shares borders with Sungei Kadut to the north, Tengah to the southwest, Bukit Batok to the southeast, Bukit Panjang to the east and the Western Water Catchment to the west. Choa Chu Kang New Town is separated into two portions by the Kranji Expressway.

The Downtown Line (DTL) is a medium-capacity Mass Rapid Transit (MRT) line in Singapore. It runs from Bukit Panjang station in the north-west of the country towards Expo station in the east via a loop around the city-centre. Coloured blue on the rail map, the line serves 34 stations, all of which are underground. The DTL is the fifth MRT line on the network to be opened and the third line to be entirely underground. It is the second MRT line to be operated by SBS Transit after the North East Line. It also serves as an alternative to the East–West Line where it runs roughly geographically parallel from Bugis to Expo station.