Underwater parks, also known as marine protected areas, are designated regions in oceans or large lakes where human activities are restricted to conserve marine life and habitats. These parks aim to protect biodiversity, allowing ecosystems to thrive without the pressures of fishing, pollution, or development. Visitors can often explore underwater parks through activities like snorkeling and diving, which promote awareness of marine conservation. Some famous examples include the Great Barrier Reef Marine Park in Australia and the Florida Keys National Marine Sanctuary in the United States, both of which showcase vibrant underwater ecosystems and diverse species.