The Adelaide city centre is the innermost locality of Greater Adelaide, the capital city of South Australia. It is known by locals simply as "The City" or "Town" to distinguish it from Greater Adelaide and from the City of Adelaide (which also includes North Adelaide and the parklands). The locality is split into two key geographical distinctions: the city "square mile", bordered by North, East, South and West Terraces; and the section of the Adelaide Parklands south of the River Torrens which separates the built up part of the city from the surrounding suburbs and North Adelaide.