Tampines is the regional centre of the East Region of Singapore. With a population of 274,360 living across its five subzones as of 2023, it is the second-most populous planning area in Singapore. It is home to approximately 5% of Singapore's population. Tampines is bordered to the west by Bedok and Paya Lebar, to the north by Pasir Ris, to the east by Changi, and to the south by the Straits of Singapore. Situated in the historical region of Tanah Merah, its present-day terrain is particularly flat due to the large-scale sand quarrying in the 1960s.
Tampines is composed of five subzones — Tampines North, Tampines East, Tampines West, Simei and Xilin. These subzones were created in the early 1990s predominantly for urban planning purposes and have no relation to the three political constituencies in Tampines. Four of its subzones are largely residential with the exception of Xilin, which has a fair mix of commercial, industrial and recreational facilities. Xilin is home to Singapore Expo, the largest convention center in Singapore, and features the largest agglomeration of golf courses in Singapore.