Yishun, formerly known as Nee Soon, is a planning area and residential town located in the northeastern corner of the North Region of Singapore, bordering Simpang and Sembawang to the north, Mandai to the west, the Central Water Catchment to its southwest, Ang Mo Kio to its south, as well as Seletar and Sengkang to its east. The development of Yishun started in 1976 with the first HDB apartments being built at the Chong Pang area. Yishun Neighbourhood 1 was developed 1981, followed by Neighbourhood 7 and Neighbourhood 2. Neighbourhood 6, 8 and 9 were developed in 1987, together with the Town Centre. Neighbourhood 3 and 4 followed slightly later in 1992. Construction of Neighbourhood 5 was started in 2009 and was completed in 2015. Within the Yishun vicinity, 8 of its neighbourhoods are allocated for construction of HDB apartments namely Yishun Neighbourhood 1 (Yishun North), Yishun Neighbourhood 2 (Taman Yishun), Yishun Neighbourhoods 3, 4 and 5 (Yishun East), Yishun Neighbourhood 6 and 9 (Yishun Central), Yishun Neighbourhood 7 (Yishun West), and Yishun Neighbourhood 8 (Yishun South). Yishun planning areas contain the subzones of Yishun South, Yishun West, Northland, Yishun East, Nee Soon, Springleaf, Lower Seletar, Khatib and Yishun Central. Areas in Springleaf and Nee Soon are largely private housing.