Changi (locally /ˈtʃɑːŋi/ CHAHNG-ee) is a planning area located in the geographical region of Tanah Merah in the East Region of Singapore. Sharing borders with Pasir Ris and Tampines to the west, Changi Bay to the southeast, the South China Sea to the east and the Serangoon Harbour to the north. It is further divided into the subzones Changi Airport, Changi Point and Changi West. Changi, excluding the two water catchments and islands of Singapore, is the largest planning area by land size.
Today, Changi is an aviation hub. It is the location of both the Changi Airport and Changi Air Base. Also located within Changi is Singapore's largest prison, Changi Prison. It was used as a Japanese prisoner-of-war camp during the occupation of Singapore in World War II. The prison is Singapore's oldest operating internment facility.