Macarthur is a region in south-west of Sydney, in the state of New South Wales, Australia. The region includes the local government areas of the City of Campbelltown, Camden Council and Wollondilly Shire. It covers an area of 3,067 square kilometres and has a population of close to 240,000 residents. The region geographically forms the foothills between the Blue Mountains and Southern Highlands regions.