Hawaii hotspot created at least 129 volcanoes, more than 123 of which are extinct volcanoes, seamounts, and atolls, four of which are active volcanoes, and two of which are dormant volcanoes. They can be organized into three general categories: the Hawaiian archipelago, which comprises most of the U.S. state of Hawaii and is the location of all modern volcanic activity; the Northwestern Hawaiian Islands, which consist of coral atolls, extinct islands, and atoll islands; and the Emperor Seamounts, all of which have since eroded and subsided to the sea and become seamounts and guyots (flat-topped seamounts). Hawaiian volcanoes are characterized by frequent
Monvert Nature Park River Gorges National Park. The nature park has two main sections, the smaller visitors interpretation centre, and the nature walk over the larger natural area. The Visitors Centre, just off the A10, contains a display of the biodiversity, forests and invasive species of the country, as a basic overview. Behind the centre is the arboretum, where over 150 labelled endemic and indigenous species are grown on grassy slopes intersected with paths. Many are critically endangered or extinct in the wild. At the bottom of the arboretum is the fernery, where many of the island's critically endangered endemic ferns and orchids