Marlow is a suburb of the Central Coast region of New South Wales

New South Wales

New South Wales is a state of :Australia, located in the east of the country. It is bordered by Queensland, Victoria and South Australia to the north, south and west respectively. To the east, the state is bordered by the Tasman Sea, which forms part of the Pacific Ocean. New South Wales...

, Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

, located on the north bank of the Hawkesbury River

Hawkesbury River

The Hawkesbury River, also known as Deerubbun, is one of the major rivers of the coastal region of New South Wales, Australia. The Hawkesbury River and its tributaries virtually encircle the metropolitan region of Sydney.-Geography:-Course:...

 58 kilometres (36 mi) north of Sydney

Sydney

Sydney is the most populous city in Australia and the state capital of New South Wales. Sydney is located on Australia's south-east coast of the Tasman Sea. As of June 2010, the greater metropolitan area had an approximate population of 4.6 million people...

. It is part of the City of Gosford local government area

Local Government Areas of New South Wales

The local government areas of New South Wales, Australia have been subject to periodic bouts of restructuring and rationalisation by the State Government, involving voluntary and involuntary amalgamation of areas...

.

Although the northern boundary and Greenman Valley Recreation Park are reachable via a dirt track from the Sydney-Newcastle Freeway

Sydney-Newcastle Freeway

The Sydney-Newcastle Freeway is a stretch of motorway linking Sydney to the Central Coast, Newcastle and Hunter regions of New South Wales. It is part of the AusLink road corridor between Sydney and Brisbane, carrying the route designation....

 at Mount White

Mount White, New South Wales

Mount White is a suburb of the Central Coast region of New South Wales, Australia, located north of Sydney. It is part of the City of Gosford local government area.It is home to a minor interchange on the Sydney-Newcastle Freeway.-External links:...

, most of the suburb is only reachable by boat, and a ferry transports mail and groceries to the residents.