One of the most popular national parks in the United States, the Everglades National Park is visited by over one million people per year. It not only a National Park but also International Biosphere Reserve, a World Heritage Site, and a Wetland of International Importance and is only one of three places in the world to be on all three lists. Rather than preserving a unique geographic feature, the Everglades was formed to protect the fragile ecosystem - largest mangrove in the western hemisphere. The park is actually a network of extremely slow moving rivers and water tours are available, but most of the areas are no-wake zones to protect the manatees.