Changi 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. Changi, excluding the two water catchments and islands of Singapore, is the largest planning area by land size.

Tanah Merah, is a geographical region located along the south-eastern coast of the East Region of Singapore. Although its boundaries are not exactly clear, it is widely accepted that the term refers to the southern coast of present-day Bedok, Tampines, Changi and Changi Bay.