Perth Hills is a term used primarily for marketing purposes to identify that part of the Darling Scarp and hinterland east of the scarp, that lies within the shires of Mundaring and Kalamunda, and as part of the constituent bodies belonging to the Eastern Metropolitan Regional Council of Perth, Western Australia.
The term is most commonly found on tourist maps, and on the government Department of Environment and Conservation pamphlets and materials relating to the regional headquarters at Mundaring Weir - The Perth Hills National Parks Centre (formerly known as the Hills Forest Discovery Centre) and its 'Nearer to Nature' programs and activities.
In earlier usage of the term 'The Hills' by people living in Perth, the identification of specific locations along the Darling Scarp (also called the Darling Range) found some places more commonly referred to than others.
Separate Hills areas
Kalamunda, and Darlington as two separate locations were frequently referred to as synonymous with the term 'The Hills' due to their presence on the edge of the Scarp and the steep roads found in those places. Greenmount Hill is often considered the 'entrance point' to the Hills because the main road - the Great Eastern Highway - passes through this location, adjacent to the route of the much earlier road, the York Road.
The Swan Hills can be that part of the hills in the area defined by Toodyay road and its passage within the north eastern part of the Swan Shire and Gidgegannup. The term 'Swan Hills' is also used in other ways as well
The hills above Armadale - and localities are quite separate from the other hills localities. 
Perth Hills is also a wine region, with some 35 wineries. The climate of warmer days and cooler nights makes it a very different region to the neighbouring Swan Valley. Larger wineries in the region combine vineyards with popular restaurants.
The Australian Geographical Indication "Perth Hills" was entered in the Register of Protected Names on 25 March 1999.