large corporations holding office in the region. The Northern Beaches area includes Manly, one of Sydney's most popular holiday destinations for much of the nineteenth and twentieth centuries. The region also features Sydney Heads, a series of headlands which form the wide entrance to Sydney Harbour. The Northern Beaches area extends south to the entrance of Port Jackson (Sydney Harbour), west to Middle Harbour and north to the entrance of Broken Bay. The 2011 Australian census found the Northern Beaches to be the most white and mono-ethnic district in Australia, contrasting with its more-diverse neighbours, the North Shore and the Central Coast. Hills district The Hills district generally refers to the suburbs in north-western Sydney including the local government areas of The Hills Shire, parts of the City of Parramatta Council and Hornsby Shire. Actual suburbs and localities that are considered to be in the Hills District can be somewhat amorphous and variable. For example, the Hills District Historical Society restricts its definition to the Hills Shire local government area, yet its study area extends from Parramatta to the Hawkesbury. The region is so named for its characteristically comparatively hilly topography as the Cumberland Plain lifts up, joining the Hornsby Plateau. Several of its suburbs also have "Hill" or "Hills" in their names, such as Baulkham Hills, Castle Hill, Seven Hills, Beaumont Hills, and Winston Hills, among others. Windsor and Old Windsor Roads are historic roads in Australia, as they are the second and third roads, respectively, laid in the colony. Western suburbs The greater western suburbs encompasses the areas of Parramatta, the sixth largest business district in Australia, settled the same year as the harbour-side colony, Bankstown, Liverpool, Penrith, and Fairfield. Covering and having an estimated resident population as at 2017 of 2,288,554, western Sydney has the most multicultural suburbs in the country. The population is predominantly of a working class background, with major employment in the heavy industries and vocational trade. Toongabbie is noted for being the third mainland settlement (after Sydney and Parramatta) set up after the British colonisation of Australia began in 1788, although the site of the settlement is actually in the separate suburb of Old Toongabbie. The western suburb of Prospect, in the City of Blacktown, is home to Raging Waters, a water park operated by Parques Reunidos. Auburn Botanic Gardens, a botanical garden situated in Auburn, attracts thousands of visitors each year, including