The metropolitan region is defined by the "Planning and Development Act 2005" to include 30 local government areas, with the outer extent being the City of Wanneroo and the City of Swan to the north, the Shire of Mundaring, City of Kalamunda and the City of Armadale to the east, the Shire of Serpentine-Jarrahdale to the southeast and the City of Rockingham to the southwest, and including Rottnest Island and Garden Island off the west coast. This extent correlates with the Metropolitan Region Scheme, and the Australian Bureau of Statistics' Perth (Major Statistical Division).