A marine park is a park consisting of an area of sea (or lake) sometimes protected for recreational use, but more often set aside to preserve a specific habitat and ensure the ecosystem is sustained for the organisms that exist there. Most marine parks are designated by governments, and organized like 'watery' national parks.
The largest marine park used to be the Great Barrier Reef Marine Park in Australia, at 350,000 km² until 2010, when the United Kingdom announced the opening of the Chagos Marine Park or Chagos Archipelago.
Although for many uses it is sufficient to designate the boundaries of the marine park and to inform commercial fishing boats and other maritime enterprises, some parks have gone to additional effort to make their wonders accessible to visitors. These can range from glass-bottomed boats and small submarines, to windowed undersea tubes.
In New Zealand a marine reserve is an area which has a higher degree of legal protection than marine parks for conservation purposes.
In New South Wales, there are planned marine parks which will stretch along the coastline of the entire state.
As of April 2008 there are no high seas marine reserves, but Greenpeace is campaigning for the "doughnut holes" of the western pacific to be declared as marine reserves. They are also campaigning for 40 percent of the world’s oceans to be protected as marine reserves.
The Australian Government manages an estate of marine protected areas (MPA) that are Commonwealth reserves under the Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act).
These are referred aquatic reserves declared under the Fisheries Management Act 1994
As of December 2013, the following marine parks have been declared under the Marine Parks Act 2007 (SA) :
The state of Victoria has protected approximately 5.3% of coastal waters. In June 2002, legislation was passed to establish 13 Marine National Parks and 11 Marine Sanctuaries. Victoria is the first jurisdiction in the world to create an entire system of highly protected Marine National Parks at the same time. Additional areas are listed as Marine Parks or Marine Reserves, which provides a lower level of protection and allows activities such as commercial and recreational fishing.